Persistent User Limit Exceeded message!

I have a full license for meeting and seminars and I am practicing fucntionality for my comapny.

I’ve managed to set up the meeting correctly but can’t get anyone else to get access. It keeps coming up with the message ‘user limit exceeded’. I have deleted additional test sessions that overlap in case there was an issue with timetabling; I have created sessions where the only attendee is myself and still 'user limit exceeded'! I have been back and forth changing the 'host'/'presenter' status on myself and a colleague to see if that makes a difference to letting people in and nothing. I have logged out and logged back in, still 'user limit exceeded'. I have set the settings to allow invited guests, allow all guests with a URL, still 'user limit exceeded'.

It’s only when setting up a meeting that I have this problem; I have set up seminars successfully but using seminars limits certain participant interactions like 'raise hand' etc.

It's really important I get this issue resolved as soon as possible, none of the troubleshooting links give any information on 'user limit exceeded'.