Hi @Audi86,
Thank you for posting in this community.
We can use PnP Power Shell to repair ID mismatch for user across all sites.
Please read this article: Repair ID mismatch for user across all Sites.
Please refer to the following steps if you are new to PnP PowerShell:
- Install the PnP PowerShell Module for SharePoint Online Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
- If you encounter this problem in connecting SharePoint Online: PnP PowerShell - AADSTS700016: Identifier “31359c7f-bd7e-475c-86db-fdb8c937548e” was not found in the catalog for the Application. Please refer to this article to resolve. Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
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