
Hi @Christian Blum,
Office Retail version and Office Volume License version are using the different update channel.
So the update version number is different, you can refer to this support article:
https://learn.microsoft.com/en-us/officeupdates/update-history-office-2019
https://learn.microsoft.com/en-us/officeupdates/update-history-office-2021
In my opinion, this is by design behavior to distinguish between the Volume License version and the Retail version of Office.
Hope the information is helpful.
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