I'm working at English academy in South Korea.

Yesterday, I made a meeting room and waited my students but nobody joined the meeting.  One student told me that could look at the waiting sign(colored green).

I checked my setting. My setting was changed by itself.(see the photo). 'Be blocked from joining the meeting ' was selected. I never choose this function. 

Should I check the setting whenever I make a meeting? 

I have set up ten recurring breakout rooms for a class I will be teaching.  Since I don't have the e-mail addresses from which each student will be logging into the meeting,

(Question)

am I correct in assuming that the students can enter the breakout room they are assigned to by name? In other words, will this work even if I don't enter their e-mail addresses myself. Am fairly sure this is correct but I don't want to find out that i am wrong after the class has started. There are 70 students in this class.

Thanks for any help.

I have created a short provocative 5 min film, where there is a “conversation” among 5 parts of my identity that have been revealed during  COVID lockdown due to the isolation that I had experienced in my life. I have set up my living room with 3 devices that were "ZOOMing" simultaneously from different angles, plus 2 more devices in other rooms. 

Please enjoy!

https://youtu.be/1lamHb42k9c