Operations on Planner Tasks via Microsoft Graph API Distort Planner UI (v1.0 & Beta)

Question

Operations on Planner Tasks via Microsoft Graph API Distort Planner UI (v1.0 & Beta)

Kaivalyamani Tripathi 0

We are experiencing an issue when performing operations using Microsoft Graph API, where these operations appear to be breaking the UI.

The issue consistently occurs when using a Service Principal (app-only authentication / client credentials flow). All required permissions are granted, and the API operations themselves execute successfully without any errors.

User's image However, after performing operations via Graph API, the UI in both Microsoft Teams (Planner) and the Android Planner app fails to load data correctly or becomes unstable.

User's image

This issue is observed across both:

Graph API v1.0
Graph API beta

This suggests that the problem is likely not version-specific.

Observed Behavior

API calls (create/update/delete) succeed with valid responses
Tasks are correctly created, updated, or deleted via API
However, immediately after these operations:
- Teams Planner UI fails to render properly
  - Android Planner app is unable to load tasks
  - Interestingly, if we manually update the same task via UI (e.g., change status), the UI starts working correctly again
But performing another operation via API causes the same issue to reoccur

Questions

We would like to understand:

Is this a known limitation when using app-only (Service Principal) authentication with Planner APIs?
Are there mandatory fields or metadata (e.g., auditing fields) that must be explicitly set when using app-only flows?
Could this be due to:
- Backend synchronization or propagation delays
  - Incomplete metadata population by Graph API
    - Differences in how UI clients interpret app-created tasks
Is this a known bug/regression in Planner/Graph API?

Key Observation

We compared the JSON payloads of:

A task created from Teams UI
A task created via Graph API (Service Principal)

We could not find major structural differences, except in some auditing-related fields and metadata.

{
      "id": "[Moderator note: personal info removed]",
      "title": "From teams", //Task created from teams
      "planId": "[Moderator note: personal info removed]",
      "bucketId": "[Moderator note: personal info removed]",
      "priority": 5,
      "percentComplete": 0,
      "createdDateTime": "2026-06-08T09:50:52+00:00",
      "dueDateTime": "2026-06-22T10:00:00+00:00",
      "startDateTime": null,
      "completedDateTime": null,
      "lastModifiedDateTime": "2026-06-08T09:51:18+00:00",
      "hasDescription": true,
      "hasChat": false,
      "isArchived": false,
      "isOnMyDay": false,
      "isOnMyDayLastModifiedDate": null,
      "orderHint": "[Moderator note: personal info removed]",
      "assigneePriority": "",
      "activeChecklistItemCount": 0,
      "checklistItemCount": 0,
      "referenceCount": 0,
      "previewType": "Description",
      "conversationThreadId": null,
      "specifiedCompletionRequirements": "None",
      "odataType": null,
      "creationSource": null,
      "details": null,
      "assignedToTaskBoardFormat": null,
      "bucketTaskBoardFormat": null,
      "progressTaskBoardFormat": null,
      "archivalInfo": null,
      "messages": null,
      "createdBy": {
        "user": {
          "id": "<user-object-id>",
          "displayName": null,
          "odataType": null,
          "additionalData": {}
        },
        "application": {
          "id": "[Moderator note: personal info removed]", //most likely planner service principal
          "displayName": null,
          "odataType": null,
          "additionalData": {}
        },
        "device": null,
        "additionalData": {}
      },
      "completedBy": null,
      "lastModifiedBy": {
        "user": {
          "id": "<user-object-id>",
          "displayName": null,
          "odataType": null,
          "additionalData": {}
        },
        "application": {
          "id": "[Moderator note: personal info removed]",
          "displayName": null,
          "odataType": null,
          "additionalData": {}
        },
        "device": null,
        "additionalData": {}
      },
      "appliedCategories": {
        "additionalData": {
          "category1": true
        }
      },
      "assignments": {
        "additionalData": {
          "<assigned-user-object-id>": "{UntypedObject}"
        }
      },
      "recurrence": {
        "occurrenceId": 1,
        "seriesId": "[Moderator note: personal info removed]",
        "previousInSeriesTaskId": null,
        "nextInSeriesTaskId": null,
        "additionalData": {},
        "schedule": {
          "nextOccurrenceDateTime": "2026-06-24T10:00:00+00:00",
          "patternStartDateTime": "2026-06-22T10:00:00+00:00",
          "odataType": null,
          "additionalData": {},
          "pattern": {
            "type": "Weekly",
            "interval": 1,
            "daysOfWeek": ["Monday", "Wednesday", "Friday"],
            "dayOfMonth": 0,
            "month": 0,
            "firstDayOfWeek": "Sunday",
            "index": "First",
            "additionalData": {}
          }
        }
      }

{
      "id": "[Moderator note: personal info removed]",
      "title": "Service Task 5", // Created from API
      "planId": "[Moderator note: personal info removed]",
      "bucketId": "[Moderator note: personal info removed]",
      "priority": 1,
      "percentComplete": 0,
      "createdDateTime": "2026-06-08T09:52:26+00:00",
      "dueDateTime": "2026-06-22T10:01:14+00:00",
      "startDateTime": null,
      "completedDateTime": null,
      "lastModifiedDateTime": "0001-01-01T00:00:00+00:00",
      "hasDescription": true,
      "hasChat": false,
      "isArchived": false,
      "isOnMyDay": false,
      "isOnMyDayLastModifiedDate": null,
      "orderHint": "[Moderator note: personal info removed]",
      "assigneePriority": "",
      "activeChecklistItemCount": 0,
      "checklistItemCount": 0,
      "referenceCount": 0,
      "previewType": "Automatic",
      "conversationThreadId": null,
      "specifiedCompletionRequirements": "None",
      "odataType": null,
      "creationSource": null,
      "details": null,
      "assignedToTaskBoardFormat": null,
      "bucketTaskBoardFormat": null,
      "progressTaskBoardFormat": null,
      "archivalInfo": null,
      "messages": null,
      "createdBy": {
        "user": null,
        "application": {
          "id": <object-id-of-our-sp>,
          "displayName": null,
          "odataType": null,
          "additionalData": {}
        },
        "device": null,
        "additionalData": {}
      },
      "completedBy": null,
      "lastModifiedBy": null,
      "appliedCategories": {
        "additionalData": {
          "category1": true
        }
      },
      "assignments": {
        "additionalData": {
          "<user-id-to-which-task-was-assigned>": "{UntypedObject}"
        }
      },
      "recurrence": {
        "occurrenceId": 2,
        "seriesId": [Moderator note: personal info removed]",
        "previousInSeriesTaskId": "[Moderator note: personal info removed]",
        "nextInSeriesTaskId": null,
        "additionalData": {},
        "schedule": {
          "nextOccurrenceDateTime": "2026-06-24T10:01:14+00:00",
          "patternStartDateTime": "2026-06-20T10:01:14+00:00",
          "odataType": null,
          "additionalData": {},
          "pattern": {
            "type": "Weekly",
            "interval": 1,
            "daysOfWeek": ["Monday", "Wednesday", "Friday"],
            "dayOfMonth": 0,
            "month": 0,
            "firstDayOfWeek": "Monday",
            "index": "First",
            "additionalData": {}
          }
        }
      },
      "@odata.etag": "[Moderator note: personal info removed]
    }

Environment

Authentication: Service Principal (Client Credentials Flow)
API Versions: v1.0 and beta
Workload: Planner (Tasks)
Clients Impacted:
- Microsoft Teams (Planner tab)
- Android Planner app

SDK Details

Framework: .NET 8
V1 SDK Used: Microsoft.Graph Version="5.98.0"
Beta SDK Used: Microsoft.Graph.Beta Version="5.131.0-preview" and "6.0.0-preview"

Nivedipa-MSFT 4,246 Reputation points Microsoft External Staff Moderator

2026-06-10T06:59:45.91+00:00

Hello Kaivalyamani Tripathi - Thanks for bringing this issue to our attention. We are checking this with engineering team, we will update you soon.
Nivedipa-MSFT 4,246 Reputation points Microsoft External Staff Moderator

2026-06-11T08:58:55.91+00:00

Hello Kaivalyamani Tripathi - Engineering team has raised a bug for this. We will let you know once w get any updates on it.
Kaivalyamani Tripathi 0 Reputation points

2026-06-15T09:29:37.3566667+00:00

Hello @Nivedipa-MSFT - Thanks for the response. Could you share any Id so that I can track it?
Jitendra Sharma 0 Reputation points

2026-06-17T11:57:50.87+00:00

Hello @Nivedipa-MSFT -Do you have any update the issue? Could you please share the tracking detail of the bug

1 answer

Your answer

Nivedipa-MSFT 4,246 Reputation points Microsoft External Staff Moderator

2026-06-10T06:59:45.91+00:00

Hello Kaivalyamani Tripathi - Thanks for bringing this issue to our attention. We are checking this with engineering team, we will update you soon.
Nivedipa-MSFT 4,246 Reputation points Microsoft External Staff Moderator

2026-06-11T08:58:55.91+00:00

Hello Kaivalyamani Tripathi - Engineering team has raised a bug for this. We will let you know once w get any updates on it.
Kaivalyamani Tripathi 0 Reputation points

2026-06-15T09:29:37.3566667+00:00

Hello @Nivedipa-MSFT - Thanks for the response. Could you share any Id so that I can track it?
Jitendra Sharma 0 Reputation points

2026-06-17T11:57:50.87+00:00

Hello @Nivedipa-MSFT -Do you have any update the issue? Could you please share the tracking detail of the bug

Answer 1

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

Hi Kaivalyamani Tripathi

Thank you for sharing the details of your scenario, and I appreciate the level of information you have provided. It helps to better understand your situation and review it more carefully.

From my testing, I attempted to replicate your scenario using both delegated and application permissions when creating Planner tasks through the POST /planner/tasks endpoint. In my case, I was not able to reproduce the behavior you described.

In my environment, I am using a basic plan, and I did not observe the lastModifiedBy output as shown in your description.

At this time, I have not found any official documentation that directly addresses this behavior. Given this, I would recommend reaching out to the Microsoft Graph support team through Microsoft Graph | Support to obtain further and more official insight.

I hope this provides additional insight.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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Operations on Planner Tasks via Microsoft Graph API Distort Planner UI (v1.0 & Beta)

Observed Behavior

Questions

Key Observation

Environment

SDK Details

1 answer

Your answer