Always sign on to ZOOM via your CUHK student account.
You will need to sign on to ZOOM via the “Sign in with SSO” option, specifying “cuhk.zoom.us" as the company domain. (Otherwise, we will have no way of knowing who you are.) If you have previously signed on to ZOOM with a non-CUHK account (e.g. Facebook), you may need to “sign out” or “switch account” in order to sign in again via CUHK.