Hello peter.funch,
Thanks for using the Apple Support Communities! We understand you are having an issue with Siri announcing messages on your AirPods, and are happy to help you find some information.
"You might need to reset your AirPods if you can't connect to them, if they won't charge, or to fix a different issue" Here is a link to assist you.
Reset your AirPods
We would also suggest taking a look at:
Announce Messages with Siri on AirPods
If you are still having an issue after reviewing the above links, please let us know.
Have a great day!