OneDrive Login Issue Persisting for Over 2 Weeks

Hello Community,

We are experiencing an issue where a user is unable to sign in to OneDrive. The problem has been ongoing for more than two weeks, and despite extensive troubleshooting, the issue remains unresolved (error screenshot attached).

Troubleshooting performed so far:

• Unassigned and reassigned the Microsoft 365/OneDrive licence.
• Re-granted the required permissions.
• Attempted sign-in using an InPrivate/Incognito browser session.
• Reset the user's device.
• Cleared browser and OneDrive application cache.

Unfortunately, the user continues to receive the same error after performing all the above steps.

Has anyone encountered a similar issue or can suggest additional troubleshooting steps? Any guidance would be greatly appreciated, as the issue is impacting the user's ability to access OneDrive.

Thank you in advance for your support.