Issue occurs every morning and we have been chasing this up with the Microsoft support team as well.

We’ve tried a lot of things but switching to and from VDI’s seems to eventually get people logged in. We’ve rebuilt mail profiles, safe mode, resetnavpane, disabled add-ins, updating Office, restarted VDIs, deleted duplicate user profiles on the VDI, deleted OSTs and temp files within AppData, cleared credential manager. One thing which seemed to help was running Microsoft SaRA. It said we had modern authentication setup on our tenant and the VDIs were using legacy. It performed the fix and sorted the issue right away. It looked to calm the problem for some time but more people started getting this again. Something to note is this usually happens in the mornings or just when someone starts work.

I know a lot of people experience the same issue but not come across a reliable fix so far.

​Issue occurs every morning and we have been chasing this up with the Microsoft support team as well. We’ve tried a lot of things but switching to and from VDI’s seems to eventually get people logged in. We’ve rebuilt mail profiles, safe mode, resetnavpane, disabled add-ins, updating Office, restarted VDIs, deleted duplicate user profiles on the VDI, deleted OSTs and temp files within AppData, cleared credential manager. One thing which seemed to help was running Microsoft SaRA. It said we had modern authentication setup on our tenant and the VDIs were using legacy. It performed the fix and sorted the issue right away. It looked to calm the problem for some time but more people started getting this again. Something to note is this usually happens in the mornings or just when someone starts work. I know a lot of people experience the same issue but not come across a reliable fix so far.  Read More

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