Jitsi Participants Connection Problems

I started a jitsi conference meet with 15 participants, all except 2 people, couldn’t log in to jitsi. Most were in different places, at home, at the office, at the park. Every participant used Google Chrome. The 2 that had issues with Jitsi were at the office, where firewall is managed by their IT folks. Their issue was when accessing and login into Jitsi, they kept losing the connection. It was a professional meeting so I don’t suspect anyone was “Kicking them out” on purpose. I saw their names popped up on Jitsi but a few seconds later, the message, “CC and Titi left the meeting”. I kept getting messages on the chat that CC and Titi kept losing connection. From what I know, all necessary steps were followed; Google chrome, PC, Good Connection. All others did not have this issue. Could it have been a firewall issue? Any thoughts?

Was that on meet.jit.si?