Private messages to a group, or other means to handle private support requests

I followed @mcwumbly instructions, but no joy to PM a group.

i.e. I go to the profile page of a member of the group, click the PM tab, delete their name in the box and (try) add the name of the group they are in. tp_painter_peeps It doesn’t accept that name and suggests alternatives not in the group.

I get an Archetype error message

Is PM groups still supported or any idea what I am missing here? Just need to stick with another method?