Hi @klaszlogt
Welcome to the Sonos Community!
This sounds much like an issue present in an earlier version of HomeKit. I recommend you factory reset one AirPlay-compatible Sonos device (say a Sonos One) and then add it to your Sonos system once more. Without adding it to HomeKit, please test AirPlay playback to it - if it works, then I can only suggest you repeat the process for your other AirPlay-compatible speakers, without adding them to HomeKit afterwards.
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein