Hi,
I created a bigbluebutton session as a role of teacher, and enrolled three other students, but turned out only me and administrator could join in session as below
a) teacher end:

b) student end:

and also:
1. I have confirmed that all three students all enrolled.

2. I have confirmed that all the users accounts are in the same timezone.
Could someone kindly help me out here? THANKS IN ADVANCE!