According to your case description, the user received an error when trying to download any file shared on Teams. This may be because the new user account did not inherit the permission settings of the old account.
Please try the following possible solutions:
- Check membership: Make sure you correctly created the user in the Entra AD admin center and configured its properties file correctly. Please refer to Create a new user, and Add or change profile information.
- Check file permissions: Make sure the new user has the correct file access rights in Teams. You can right-click the file in Teams, select "Manage access", then add the user and grant the appropriate permissions. Please refer to Error when opening a file in Teams: You don't have access to this file.
- Check permissions and settings in SharePoint or OneDrive: Shared files are also stored in SharePoint or OneDrive, please make sure the user has the appropriate permissions on these platforms. Please refer to "Access Denied" or "You need permission" errors in SharePoint Online and OneDrive.
- Clear cache: Try asking the user to clear the Teams client cache and then log in again.
- Waiting for sync: Sometimes permission changes take some time to take effect. Please wait a few moments before trying to access the file again.
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