Validating external whiteboard collaborators

I finally sorted out how to allow whiteboard collaboration by people outside my organization (yes, I am the admin for my paid zoom account). But now I'm finding it's important to document who is making changes and comments.

Is there a setting for forcing external collaborators to sign-in or otherwise validate who they are? Can this be done with more than just a zoom account? could they sign in to my whiteboard using their Google credentials, for example?

Help!

Jim