After attempting to log into a conference room, you receive an error telling you the user name or password was incorrect:
You have attempted to enter the conference room using an invalid user name or password. The user accounts and passwords in each conference room are controlled exclusively by the owner of that conference room. Contact the room owner directly to resolve this issue. Do not contact support as we are unable to modify indivual user accounts, or retrieve lost passwords.
Because banning can delete the associated user account, some users who have been banned may also receive this error, depending on how user accounts are managed in the room.