JoinRandomRoom does not work in Unity 2018?

Hi,

I have a project that was working fine in Unity 2017.2.0p2 but after upgrading to 2018.1.2f1 JoinRandomRoom no longer works even if i have a room open.
All i get is: Operation failed: OperationResponse 225: ReturnCode: 32760 (No match found). Parameters: {}

Does this happen to anyone else or is it just me?

My PUN version is v1.90

Best regards, Ludvig