"The Microsoft Exchange Administrator has made a change that requires a restart of Outlook.” - error

Hi all,

we are having this issue with some of our users. The message (error) appears just once, Outlook (M365 dekstop app) is restarted and everything is working well.

Why is this happening, nothing is changed on Exchange Online and Exchange Server 2016 (we have a hybrid-mode)?

Kindest regards

Leon