Exchange Backup Fails With: "There is an error in XML document"
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Challenge
Starting on December 11th, 2023, Exchange backup within Veeam Backup for Microsoft 365 fails with the following errors:
There is an error in XML document
and
The specified type was not recognized: name='SharingMessage'
Cause
Veeam has observed that there have been changes to the structure of the XML message received from M365 referencing the SharingMessageType property received from EWS. The Veeam Backup for Microsoft 365 software is unable to process this XML structure.
WSL definitions of EWS service can be found here: EWS XML elements in Exchange
Solution
The issue is fixed in latest Cumulative Patch for:
More Information
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