BM is implementing controls to disallow mis-configured hotspots from connecting to their network. Some of our early configurations violate this and cause a connection to not complete. Here is what you need to check:
in /opt/MMDVM_Bridge/MMDVM_Bridge.ini
Make sure your RX Frequency matches your TX frequency and that your callsign is correct for your DMRID+SSID
 
restart.

We have a replacement connection method in beta test now. That method, Simple Terminal Feature Update uses the connection method required by BM. By implementing Simple Terminal Feature Update we will satisfy BM now and in the future.

Steve N4IRS