Webrtc no longer working, wrong password, unclear what to disable, worked before

[jtuinstra (jeroen)]

The freepbx webphone used to work fine, but recently we updated to the latest Asterisk version 18.6.0.
Now when we login to the UCP the softphone/webrtc is not registring:

Phone Status: Registration Failed

And in logs of Asterisk:

[2022-02-08 20:00:46] NOTICE[10588] chan_sip.c: Registration from '<sip:[email protected]>' failed for 'xxxx.xxxxx.xxxxx:14094' - Wrong password

We have a valid SSL certifcate and we have set in the extension 402 (chan_pjsip) advanced settings:

Enable WebRTC defaults: Yes

I saw this reference (from 2018) but I am unclear what to actually do:
WebRTC and SIPML5 - Wrong password

Can someone help me out.
It used to work by the way.

[jtuinstra (jeroen)]

In the general advanced settings I set this:

SIP Channel Driver: chan_pjsip

The webrtc is registered but the phone is ringing yet audio is not working.

Maybe a related error in the log:

[2022-02-08 20:43:44] ERROR[2411] pjproject: 	   icess0x7ff284fd9048 ..Error sending STUN request: Network is unreachable

[jtuinstra (jeroen)]

We have had to reset this setting as the external phone could not connect or got cut-off after a few seconds. So the setting seems to break our main lines.
So we are back at the beginning.