Multi Users Activation Error

I have 16 Cubase v13 computers in a multi user/school environment. I have installed Cubase fine on 15 of them and we are using their Multi User script that activates the computer for any user.
steinberg.help/multiuser-guide/deployment-manual

There is one computer (identical to all others) that installs fine, but any user that logs in gets ‘No valid license found’.

I can see the computer name listed in My Steinberg activation manager as ‘Activated’.

I have tried removing the computer from the account, completely reinstalling Windows 11 and Cubase, it activates (using their script - ‘License successfully enabled for all users’) and appears back in activation manager but it still errors for any user - ‘No valid license found’.

Any ideas?

I have raised a Cubase support ticket but their response is so slow, It’s been 5 days and no reply…