After upgrading to Veeam Backup for Microsoft 365 6.0, the repository upgrade fails with the error:
Failed to upgrade repository database Error: JetError -1504, JET_errNullInvalid, Null not valid
Solution
The issue is fixed in Veeam Backup for Microsoft 365 6.0 Cumulative Patch P20220413 (6.0.0.379) - KB4285.
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