howto delete relationship with github (or any other)

[jhaar]

Somehow my Krypton has a broken relationship with github. ie when I try to authenticate with my webauthn key, my phone buzzes (ie the transaction reaches it) but github states it's failed. So I deleted my "security key" from my github profile and when into my Android Krypton app... but cannot find a delete button for existing relationships? If I ignore this can create a new one on the github end, I just end up with yet another "broken" relationship. I have working relationships (what is the correct term? that ain't it ;-) with Google, Okta - so Krypton is working in general.

So how can I delete my github "hook" so that I can create a new one? I keep going on about github because that's what's affecting me - but this is actually a general question about any website linked to Krypton.

Thanks!