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You are using the same "unique user ID" for both host and participant (the TRAINME in EXT-CLEVERSPRING-TRAINME) so when the two users login they actually become the same users in LCCS (and either the second one override the first or it gets ignored).

You need to use different user IDs when you create the authentication token. Assuming those users login into your system first (and you do have a unique id for them) you should use that value for LCCS too (or if you don't trust us and you are 100% sure that users have all unique names you could use an hash of their displayName)