Links expiring

[Mazz]

Hello all

We are having a bit of trouble with our meeting links expiring recently and are not sure why this is happening. 

It has been suggested to us that if someone has joined the meeting, before the meeting is scheduled, and has chosen 'end meeting for all' then this would cause the meeting link to expire. 

Does anyone have any thoughts as to why this might be happening please, and how we can prevent it?

Meetings might also be scheduled to cover up to 6 sessions taking place on different days.

Thanks in advance for any advice