Wondering if these Apple Support articles are of any help:
Eg: May depend upon your settings:
How to: Change the settings of your AirPods and AirPods Pro – Apple Support
And
Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support
Says:
"You can use Siri with your AirPods to ask questions and make phone calls.
Siri can also control your music and check on your AirPods.
To set an AirPod Pro to use Siri, press and hold the Touch control".
And if you use iPhone:
Announce calls, messages, and more with Siri on iPhone – Apple Support
Siri can announce calls and notifications from apps like Messages on Air Pods 2nd gen or later.