I have tried toggling the button multiple times, after updating to latest version of QGO. The QGO kept declining the pairing code, as being wrong. So I've uninstalled QGO, installed it again, but still didnt worked.
Fortunately for some unknown reason it started working as always after I restarted the headset.
Maybe I've got some corrupted update from Meta (even through I'm not in PTC), or something...