Hi ​@Denis Lucet, thanks for reaching out!

I wasn’t able to reproduce the issue on my side — the Save board as template option is active for me.

Could you try duplicating the board first and then see if the duplicate can be saved as a template? Sometimes creating a fresh copy helps bypass restrictions that might apply to the original board.

If the option is still greyed out after duplicating, it could be related to either your plan type or your board permissions. Let me know what happens when you try with the duplicate.