I have an Apple passkey set up with GitHub...
In Safari it's directly integrated, while in other browsers (even other operating systems) I get the option to display a QR code and approve the sign-in on my iPhone. Here's what that looks like in Arc:
In Orion I do not get the QR-code option at all.
As I don't have a physical security key to insert, I'm unable to sign in to GitHub at all from Orion, even though it works fine from Chrome, Edge, Firefox, Vivaldi, Brave, and Arc.
It would be really nice if Orion supported this to the extent all other non-Safari browsers seem to.