Perhaps you had set your Dots to be able to call one another; ask kitchen to call family room, etc. If so, here is an easier way:
Ask any Dot to call family room and one will answer -- that's the family room, unless the one you asked to make the call says it is the family room and can only call other devices. The one asked to make the call is the family room. Continue the process for all the Dots for un-found rooms.
When I tried this, and asked to call the dining room, I got a reply that it was unavailable. It worked to answer questions, etc, app showed it was online, so what was up? I just unplugged the dining room Dot for five minutes and when it came back on it would answer again. This is a good test for people with many Dots to check things out!