CCU limited to 20, license says 100

Hi, as in the title, we have photon server installed, with the free license that says 100 CCU (I can see this in the photon settings menu).

However, when we go over 20 users, no other users are able to join. We also get the following error in the log.

7448: 12:11:35.533 - CTCPSocketServer::ReadCompleted - Exception - CTCPSocketServer::CreatePeer() - Licensing limit: Concurrent connection limit reached. No more connections allowed

I can see that the license is installed, but it seems to be being ignored. Do you know how I fix this?

Thanks