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BugZero found this defect 2006 days ago.
License Auto Update fails
Any licenses obtained prior to U4 are now known as ‘Legacy Licenses’. Auto Update functionality cannot migrate a Legacy License to the new Veeam Instance License. The message most likely received is: Error Server message: License key type is not supported at the moment.
Obtain a new Veeam Instance License and Auto Update will function again.
https://helpcenter.veeam.com/docs/backup/vsphere/license_autoupdate.html?ver=95u4