About the maximum number of breakout rooms

Because the maximum number is 300 in Zoom meeting by our university license, the maximum number of breakout rooms is the followings.

The number of breakout rooms Maximum number of participants assigned to the breakout room*
20 breakout rooms     Maximum number of participants is 300.
30 breakout rooms     Maximum number of participants is 300.
50 breakout rooms     Maximum number of participants is 200.

Reference to Zoom help center.

In addition to the above, there is a limit of 200 people if you assign the breakout room in advance.
You can't make the breakout room has more than 200 participants in advance.