Pre-assigning participants to breakout rooms

Is this meeting need register ?

Please make sure they login in to zoom firstly and then join meeting

If still not work, may be you need to know whick client they are using to join meeting. Zoom Client(Mac/Win), webclient, chrome book, chrome extension or other platform.

We suggest users join meeting from zoom client and webclient if use pre-assign break out room

Thanks for your response. This is not a meeting that they have to register for. I scheduled a meeting then sent them the meeting link. They would have joined the meeting from the link in their email inbox. Would this make a difference? 

If i'm your meeting attendee, may be i will join the meeting by clicking the join link instead of login in to zoom client to join. so we will not know the attendee's email, and the pre-assign will not work.

Please make sure attendees login in to zoom client and then click the join link.

Ok great, thanks that makes sense. If I make them register, then that would eliminate this problem? Because if they register, then they would have to sign into Zoom with the email they registered with in order to join.

Thank you!! I think that will do the trick. There is a little button to click to Require Authentication. I think that will work. Thanks so much!!

I have pre-assigned people to breakout rooms but only about half of the people have gone into the rooms and the rest had to be moved over by myself manually.  Does anyone know why they don't all automatically move into the rooms? 

I can see some possibilities in the answers so far - perhaps the people are not using the correct email or equipment - but this doesn't seem to make sense when so many of them don't move automatically.