As the title suggests when the 51st person tries to join a conference room they get an error.
What are the occupancy limits set on the room? 50?
Yes. Spark in itself doesn’t have occupants limit. What is the error exactly, btw?
If Openfire is used as a server, then it is usually 30 occupants. So, your server admin has actually bumped it to 50 for that particular room or for all rooms (default room setting).