this post was submitted on 05 Jun 2023
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I'm not a frontend dev, and I feel like CORS stuff comes into play here, but it should be possible to do something like the "Sign In With Facebook" or "Pay with Paypal" type of redirect after asking the user for their host. At very worst it should be possible to have Instance B's backend send a call to Instance A after the user provides it with the name of the other instance, but you need to be careful about validating the legitimacy of the request in that case. There's a lot of room for better cryptography/signatures in activitypub I'd imagine that could help.
That would probably require third party cookies which most people block for very valid reasons