62516: Acronis Backup Cloud: Office 365 mailboxes backup finishes with warning 'Exchange Web Services are not currently available for this request'

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Backup of Office 365 mailboxes finishes with warning:

Exchange Web Services are not currently available for this request because none of the Client Access Servers in the destination site could process the request.


This error means Microsoft has no available servers to process our requests (due to high load, for example).


You can increase the number of backup retries.

In next versions of Acronis Backup and Acronis Backup Cloud, we will implement automatic increase for the number of retries in this case.


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