I’m wondering if someone could help with this and apologies if I’m missing something obvious. 
I’ve added two era 300 to my system and want to use them as surrounds. 
When I added the 300s they each set up in their own new rooms.
I have an existing room called TV with a beam and sub. When I click on that room and select add surrounds, I get a message saying I need two identical speakers to use and this is what I don’t understand. I have two identical 300s but they were automatically placed in their own rooms when I added them, so is that why my tv surround room can’t access them? What do I need to do to be able to add them as surrounds?

Thank you.

Alastair