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BugZero found this defect 1579 days ago.
When you configure a Veeam Agent backup job, the Microsoft OneDrive dialog window does not allow changes and closes automatically. As a result, it is impossible to change the account used to access Microsoft OneDrive as a backup target.
Such behavior occurs in case there is a Microsoft account added in Settings > Accounts > Access work or school.
There are 2 options to use Microsoft OneDrive as a backup target when configuring a Veeam Agent backup job: Use the account that is already set in Settings > Accounts > Access work or school to store backups on Microsoft OneDrive. Disconnect the account that is set in Settings > Accounts > Access work or school. Veeam Agent allows to change accounts if the computer is disconnected from the account. Configure the Veeam Agent backup job, then re-connect the account.