@SebastianCerazy-1155, Thanks for posting in Q&A. From your description, it seems the SCEP certificate renew is not working on some devices. To troubleshoot this, you can refer to the following link to see if there's any finding.
https://oliverkieselbach.com/2022/09/21/deep-dive-of-scep-certificate-request-renewal-on-intune-managed-windows-clients/
Note: Non-Microsoft link, just for the reference.
Hope it can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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.