signin with Facebook cannot change account

[weakwisdom]

After signin with Facebook, even if the signout method in the plugin is called, the next time you try to siginin, you will still be prompted to signin with the last success signin account.
If you select Cancel at this point, [hippogames.dev/api/oauth/redirect] this callback page will display "Error [Invalid parameters]"

Android can access the Facebook website through a web browser, log out of the current logged-in user, and in this way "clear the cache" and fill in a new Facebook account the next time you log in, which is not possible with iOS

[hippogamesunity]

Hello! We can't manage how Facebook website displays the sign-in page. The app only redirects users to the sign-in endpoint.
https://developers.facebook.com/docs/facebook-login/guides/advanced/manual-flow?locale=en
"Whether someone is not logged into your app or not logged into Facebook, you can use the Login dialog to prompt them to do both. If they aren't logged into Facebook, they'll be prompted to login and then move onto logging into your app. This is automatically detected, so you don't need to do anything extra to enable this behavior."

I'll check the error from Authentication Middleware.

[weakwisdom]

in facebookauth.cs

    public void SignOut(bool revokeAccessToken = false)
    {
        TokenResponse = null;

        if (SavedAuth != null)
        {
            SavedAuth.Delete();
            SavedAuth = null;
        }
    }

the param "revokeAccessToken" do nothing, but in appleauth or googleauth, there is RevokeAccessToken function to do something...

[hippogamesunity]

Need to implement and test this call:

[hippogamesunity]

I've implemented valid access token revocation. The asset update will be available soon. Please let me know if the issue fixed now.

[weakwisdom]

I updated the plugin to v1.4, facebookauth's RevokeAccessToken method does take effect, when this method is executed, the current account is in the corresponding management page of facebook, and the corresponding application login permission can be deleted.

However, in the application that uses the simplesignin plugin, if you choose to log in with your Facebook account again, the web page opened by the application will still be uncontrollably displayed asking whether you want to log in with the Facebook account that you successfully logged in before (in fact, you have logout the account and executed the RevokeAccessToken), and in addition to using the method of deleting the app and reinstalling it, You can't log in with another Facebook account (as I mentioned before, Android or PC can solve this problem by logging out of the currently logged-in user by visiting the Facebook website on the web page, but not iOS).

If you select No, the page displays an error [ hippogames.dev/api/oauth/redirect?error=access_denied&error_code=200&error_description=Permissions+error&error_reason=user_denied&state=3f28a51c0a934ed08408ac3516ef629e#=]

In short, fixing RevokeAccessToken doesn't help facebook signin's multi-account switching.

I hope that the author can consider the user's multi-account switching needs

[hippogamesunity]

This how Facebook endpoint works and uses web cookies probably. I'm not sure if I could implement other options to help you with the issue.

A few years ago I was integrating their native SDK. Spent days, it was not easy definitely, but it worked. Also not cross-platform. Maybe this could be an option for you.