We just installed a new license, which is also labeled Participant User, but is different than the classical participant users for Forms. It is a license that should grant both access to the repository and forms. I think it is called non-LDAP participant user.

I setup a test account, and I was able to grant the account access to the repository. But they are unable to find the account anywhere in Forms under either the Named User or Participant tab, I was expecting it to show under the Named User tab because that tab syncs with repository users.