Bluetooth Earphones Not working (Propably)

We have a project that is going great. We only have a problem with the audio.

Smart phone: check
Smartphone with wired headphones: Check
Smartphone with bluetooth headphones: no sound or corrupted sound

happens in every device/Browser

Does anyone have any idea why this might be?

Also happens with every headphone? If you have just this one, consider those broken or incompatible and try others.

I tried a lot of different :(