I have my fathers Sonos soundbar and a pair of speakers at home that I bought for him as Christmas gifts years ago. I still can't believe they knowingly released an app that bricked older devices.

I have to try and get them working again. The only solution I've heard of is to get an old version of the Sonos app APK, a dedicated old single purpose Android phone to acts as a bridge between your speakers and phone and connect that way.

Stay away from Sonos.