Error while joining a meeting with Phone Audio + Dial in manually doesn't work

gregm4 phanney01 I just ran into this working a trouble ticket for my organization. Got the exact same "The user is unavailable at the moment" error. It was a reoccurring meeting the person was trying to join using the phone audio option. Joining any other meeting including test ones I setup didn't recreate the issue. However, when I copied the meeting link and tried to join from my account I saw the same error. Finally, I figured the meeting organizer had done something odd, rescheduled the meeting too many times, messed with the meeting options, something I wasn't seeing and I said I'd have to reach out to them to see if there was something unique they had done or had happened recently and that's when the user informed me they were no longer with the organization. I think the issue we're looking at is that though the phone audio option doesn't require a PSTN dialing package, a phone audio/call me at feature requires an active account tied to the organizer to make those outbound calls to people joining by phone. Would love to get confirmation from Microsoft as I thought I'd do a quick search for corroboration and this forum was about the only thing I could find that matched up with the issue, I'm guessing it has something to do with that...