I am not this guy but I experience the same thing here. Also, there is this question but the author there uses a different flow, so I don't really know if it fits.
In short, I implemented the flow invite-via-email. I could generate the invitation link and the user could click on the link to sign up.
However, after signing up, the user is redirected to the main login page again. The user has to type the credentials again to sign in.
How can I implement auto signing after the user sign up with the invite-via-email flow?
There is a comment on that GitHub thread about id_token_hint something but I honestly do not get it. Many thanks.
If it helps, my setup is Azure Static Webapp with Svelte for frontend and Azure Functions for the backend.