I have the same problem and here is my story about it:
Using 21.10-latest and using a Marshall Woburn II Bluetooth speaker, when putting the speaker into discovery mode, both hcitool & Bluetooth Devices(Bluetooth Manager) find it yet system always ends up with "Bluetooth: Pairing failed for: WOBURN II...".
I have the same problem and here is my story about it:
Using 21.10-latest and using a Marshall Woburn II Bluetooth speaker, when putting the speaker into discovery mode, both hcitool & Bluetooth Devices(Bluetooth Manager) find it yet system always ends up with "Bluetooth: Pairing failed for: WOBURN II...".
```
$ hcitool scan
Scanning ...
54:B7:E5:70:E8:37 WOBURN II
$
```