Hello Edgar, hope you're having a great week!
Currently this is not an available feature to Administrators/Owners of HipChat groups. Additionally on top of disabling private-messages you would have to restrict users from creating rooms to really block all 'private messages'.
Does that last part make sense?
...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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