Hi, @BESANÇON Ludovic
Thank you for posting in Microsoft Q&A forum.
It seems many people have the same issue with you, here is their discussion:
https://techcommunity.microsoft.com/t5/windows-server-for-it-pro/adk-for-windows-11-and-adk-for-windows-server-2022-vamt-does-not/m-p/2719842
And you may try the resolution like PColuna said:
Run the command in the VAMT database:
alter table base.GenuineStatusText alter column GenuineStatusText nvarchar(255) NULL
https://www.reddit.com/r/sysadmin/comments/oypsd8/vamt_database_not_a_valid_vamt_database/
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