Please confirm you are running Veeam Backup for Microsoft 365 build 22.214.171.1243 or higher prior to installing this cumulative patch KB4278. You can check this under Help and Support > About in Veeam Backup for Microsoft 365 console. After upgrading, your build version will change to 126.96.36.1993.
As a result of ongoing R&D effort and in response to customer feedback, cumulative patch KB4278 provides a set of enhancements and bug fixes, the most significant of which are listed below:
This Cumulative Patch also includes all fixes that were present in Veeam Backup for Microsoft 365 5d Cumulative Patch KB4235, Veeam Backup for Microsoft 365 5d Cumulative Patch KB4222 and Veeam Backup for Microsoft 365 5d Cumulative Patch KB4270.
To install the cumulative patch KB4278:
This form is only for KB Feedback/Suggestions, if you need help with the software open a support case