Bluetooth pairs and connects, but no sound

Xperia 10iii
4.4.0.68
Sony XAV-AX1000

Well, it pairs and connects and the sound disappears from the device, but no sound emanates from the Sony.

Devices that pair and work correctly.

XperiaX 4.4.0.58
iPhoneSE3 iOS 15.6

I was particularly pleased when the Bluetooth on/off bug on the XperiaX was fixed. I guess I’ll be on my X for a while yet

I know BT is flakey at best, but there you have it. Anyone with similar problems on the latest version of SFOS?