question

Hi,

We let the player log in via device. Then after a few games he can link with FB.

As explained in the tutorial (https://api.playfab.com/docs/tutorials/landing-players/facebook-unity) linking the player works nicely:

public void LinkFacebook()
        {
            Debug.Log("Link Facebook");


            FB.Init(OnFacebookInitialized);
        }


        private void OnFacebookInitialized()
        {
            Debug.Log("Logging into Facebook");


            // We invoke basic login procedure and pass in the callback to process the result
            FB.LogInWithReadPermissions(null, OnFacebookLoggedIn);
        }


        private void OnFacebookLoggedIn(ILoginResult result)
        {
            // If result has no errors, it means we have authenticated in Facebook successfully
            if (result == null || string.IsNullOrEmpty(result.Error))
            {
                Debug.Log("Access Token: " + AccessToken.CurrentAccessToken.TokenString);
                ZPlayerPrefs.SetString(fbAccesKey, AccessToken.CurrentAccessToken.TokenString);


                LoginWithFacebookRequest request = new LoginWithFacebookRequest()
                {
                    CreateAccount = true,
                    AccessToken = AccessToken.CurrentAccessToken.TokenString,
                    InfoRequestParameters = accountParams
                };
                PlayFabClientAPI.LoginWithFacebook(request, OnLoggedIn, OnLoginError);
            }
            else
            {
                Debug.Log("Facebook Auth Failed: " + result.Error + "\n" + result.RawResult);
            }
        }

When the player logs in for a next game, we have the following Start method:

       void Start()
        {
            if (HasStoredLogin()) {
                LoginWithEmail(ZPlayerPrefs.GetString(emailKey), ZPlayerPrefs.GetString(pwdKey));
            } else if (HasFbAccesKey ()) {
                LoginWithFacebookRequest request = new LoginWithFacebookRequest() {
                    AccessToken = ZPlayerPrefs.GetString(fbAccesKey),
                    InfoRequestParameters = accountParams
                };
                PlayFabClientAPI.LoginWithFacebook(request, OnLoggedIn, error => {
                    OnLoginError(error);
                    instance.LoginWithDevice();
                });
            } else {
                LoginWithDevice();
            }
            #endif
        }

Although HasFbAccesKey returns true and the AccesToken (retrieved from the linking) is passed in the request, the LoginWithFacebook call returns an error and thus a LoginWithDevice is called (which isn't so bad).

But I fail to see why the LoginWithFacebook call doesn't succeed. What could be the issue?