Ipreviously connected my iphone xs max to my columbus system by bluetooth & everything worked fine,since i connected apple car play the music from my phone no longer plays by bluetooth,so i stopped car play & reset the bluetooth connection from the phone (forget) & reconnected bluetooth,but the columbus still fails to play the music over bluetooth, has anyone else had this problem & know the solution ?

Use Apple music via CarPlay - this is what I do on my non-Skoda car.