Appointments+ cannot add new service

I purchased Appointments plus last year, believing that I then owned a license. Subsequently WPMUDEV introduced appointments lite, so I only get the full plugin if I pay a monthly subscription. I managed to get away with just the lite version until now. But I need to add a new service, taking me to 8 in total. So I purchased an Appointments+ license and installed the WPMU Dashboard.

However, when I go to add a new service, it still says:
"You have reached the limit for the free version. Upgrade to Appointments+ for unlimited services".

I'm not sure what to do next. Please advise.
Many thanks,

Stuart