it is not working

[cyj]

After I paid a bill for upgrade, waiting room doesn't working at all.

[Rupert]

You may need to assign your license to your profile.

Edit your own user here and add the package you have already purchased to your profile. https://zoom.us/account/user#/

Or check that Waiting Room is enabled here: https://zoom.us/profile/setting

Hope this helps.

Rupert