No direction sounds on samsung connected phone

Hello Everyone
I have two samsung phones
1x A15
1x A12
All works without any issues using the A15
whereas
The A12 works with the visuals OK, but there is no sound through the car speaker system.
Have checked and check the settings on the A12 (which are identical to those on the A15)
But NO SOUND!!!
The A12 works without any problem with the google app system.
Are there other A12 owners with the same problem?
Any help and guidence would b appreciated.
C