Error message: Meeting has reached maximum attendee capacity.

For the last three days, registrants for my daily meeting have been getting this error message. 

I have a large room so my capacity is 500 and this is happening with less than 200 people in the room.

I have contacted support multiple times with no solution yet.

For context, I have done this meeting for almost five years so it is not a new set up.

I typically run 300-500 every morning and today we were at 130 with multiple people sending screenshots of this error message.

We run the meeting off the zoom app on a desktop.

We have updated the app to the latest version but other than that, I can't imagine what else can be done from my end.

Has anyone experienced this before? What did you do to resolve it?