1-1 messaging isn't a feature settable via permissions, unfortunately. By default all regular (i.e. non-guest) users are able to send private messages to all other regular users.
Guest access users are only able to message in the room that they have access to (they cannot send 1-1 messages to other users).
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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