BP50 Bluetooth transmit

I cannot get B50 to transmit to iPad or pixel phone.
After numerous tries I can get my Sennheiser headphones to connect in transmit mode in Go Control app. When I look at Bluetooth connection in iPad settings I observe connection has changed to BP50-BLE. However when I go to Spotify or YouTube to listen I cannot select the Sennheiser headphones as a device for listening. I have also tried numerous other Bluetooth headphones with the same results. Bluetooth receive is not a problem, iPad will connect almost instantly and I can see BP50 as a device listed in Spotify menu. Any help would be appreciated. This device seems to be very picky with Bluetooth connections.