Ok but now do a service that doesn't support that, whether or not it might in the future 'become a pretty common pattern'.
replyOn most websites logging in through QR codes works out of the box for passkeys. You usually click "log in with device" or something like that with every desktop OS.
replyYou scan the QR code, click the confirmation button, and you're signed in. It's part of the standard UI of normal operating systems.
Might not work (well) if you're on an old computer without decent Bluetooth but everything has Bluetooth these days.
so you need to have discord installed in your phone.
replynow multiply it with every web site you want to access.
That is how discord has chosen to implement it but nothing about the scheme actually requires an app besides a mobile browser and QR code scanner to be involved.
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