Two peers are unable to connect after MCU in turned on for an Application Key. This scenario works fine for a P2P connection ( i.e. a non-MCU key ).
Steps to reproduce
1. Peer A joins a room (MCU enabled)
2. Peer B joins the same room.
3. Both ends do not receive information of each other's presence in the room.
Issue has been confirmed and rectified in the 0.6.7 release of SkylinkJS. See: release notes.