Siri won't dial calls since updating to iOS 15.4
When I say, "Hey Siri, call Bob Smith [or any name in my Contacts," Siri says, "Now calling Bob Smith," and the Siri pulsating icon appears on the iPhone 11 screen briefly. But Siri doesn't actually dial. I have the same problem whether I am using Siri with the iPhone, AirBuds Pro, or my car's wired CarPlay.
I have tried hard-resetting the phone and turning Siri off and on again, but no joy. I had no Siri problems prior to updating to iOS 15.4.
Other Siri commands work as before. Help!