Hello,
as admin, I am trying to rename a scrum board: I go to board configuration and click on the pencil. However, once I validate the new name I have the following error message

and the board name remains finally unchanged.
Does anyone has an idea what I can do? I'd like to not have to create new boards as it does not keep the sprint history.
I have read on some forum that the sprint feature needed to be deactivated, but I don't find where to do it.
Regards
Loic