Matchmaking error from Matchmaking.StartMatch

{"error":{"message":"There is no active match associated with the room 1,362,581,287,493,862.","type":"OCApiException","code":100,"error_data":{},"error_subcode":1891323,"fbtrace_id":"ASbZIyEAZcFY6N-8_pgFxpb"}}

I'm trying to implement matchmaking. I have two instances of my project running using ParrelSync. The clone project is logged in using a test user account. I pass the entitlement checks and the two users find each other and join the room. However, I don't know what to do pass this point after receiving this error.