I am probably in the beta, and my event types that had been set to multiple attendees, and had a daily limit of 1/day gave this message any time someone tried to join an existing meeting, such as the second registrant for a particular event.

 

I had to disable all my daily limits to make these events functional again. This is a major problem for my Calendly usage, and am hoping it will be rapidly fixed. I Frequently use Calendly to schedule up to 5 people into a single event, and I need to be able to limit the number of each event type per day.