afaik you cant even connect with a profile which has not the required security level. sounds like a permission problem to me (not assigned to guest group).
try to create a new teamspeak ID and connect with that to our server. settings - identities ( ctrl + i )
if you have the ts server in your favourites you can select the identity on server preferences
[update] he is not in the server guest group, only in 2 "-------------" groups, this might be the problem. hes trying to create a new id now...
[update2] solved
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