'How to use Asp.net core Identity External OAuth Authentication when no user signed in?

I'm writing a project that uses Github OAuth, when the user chooses to log in via Github, it needs to create an account if the user doesn't have one.

But I noticed that the CreateTicketAsync method of OAuthHandler receives a ClaimsIdentity object, does this mean that external OAuth can only be added on users who are already logged in?

Is there any other way to achieve my needs?

c++sharpasp.netasp.net-coreoauth-2.0asp.net-identity


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