Plain_internal and token authentication simultaneously

Can local authentication and token authentication be used at the same time?

A given Jitsi-meet domain maps to a Prosody host, and a Prosody host accepts only one line ‘authentication’, with only one value. So unless you want to try to use 2 hosts for a single Jitsi-meet setup - I don’t see why this could not work but I don’t see the point and it would be awkward to manage -, what you want is not possible.

I have token authentication on the jitsi server but I’d like to prohibit anonymous users from creating meetings. Is that possible?

that’s a different question and I don’t know token authentication. Search the forum, from the posts I remember, people seem usually to have the opposite problem.