When unlink email account, Error Domain=FIRAuthErrorDomain Code=17016 "User was not linked to an account with the given provider."

Environment

• Xcode version: 10.2.1
• Firebase SDK version: 6.5.0
• Firebase Component: Auth
• Component version: 6.5.0
  *swift 5.0.1

I tried to unlink email account. like below code.

Auth.auth().currentUser?.unlink(fromProvider: EmailAuthProviderID) { (user, error) in
    if let error = error {
        print(error)
    }
}

but I got an error,

Error Domain=FIRAuthErrorDomain Code=17016 "User was not linked to an account with the given provider." UserInfo={NSLocalizedDescription=User was not linked to an account with the given provider., FIRAuthErrorUserInfoNameKey=ERROR_NO_SUCH_PROVIDER}

I also tried

let user = Auth.auth().currentUser!
let providerData = user.providerData
for provider in providerData {
    Auth.auth().currentUser?.unlink(fromProvider: provider.providerID) { (user, error) in
        if let error = error {
            print(error)
        }
    }
}

And I got the same error.
I tried to unlink after reauthenticate the email, but the same result.

GoogleAuthProviderID and FacebookAuthProviderID worked successfully, but only EmailAuthProviderID not worked.
How can I unlink EmailAuthProvider?

[morganchen12]

Is this the case for every user or just one user in particular?

@morganchen12 Yes, I tried multiple accounts, But every user got the same error.

I also tried on quickstart-ios/authentication/, and I got the same error.

I changed

• GoogleService-Info.plist
• Bundle Identifier
• Associated Domains
• actionCodeSettings.url

Is my Firebase account broken?

[morganchen12]

No, your Firebase account isn't broken; it's most likely a bug in Firebase Auth.

[renkelvin]

@Hamada-Yuji I'm not able to reproduce the issue. Could you share the full steps how to reproduce? (including how the user is created and linked)

@renkelvin
In my code

// EmailLoginViewController.swift
@IBAction func sendAuth(_ sender: Any) {
  let actionCodeSettings = ActionCodeSettings()
  actionCodeSettings.url = URL(string: "https://www.example.com") // replace my own link
  actionCodeSettings.handleCodeInApp = true
  actionCodeSettings.setIOSBundleID(Bundle.main.bundleIdentifier!)
  Auth.auth().sendSignInLink(toEmail: mailTextField.text!, actionCodeSettings: actionCodeSettings) { error in

      if let error = error {
          print(error)
          return
      }
      UserDefaults.standard.set(self.mailTextField.text, forKey: "email")
  }
}

// AppDelegate.swift
func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
    guard let url = userActivity.webpageURL else { return true }
    let handled = DynamicLinks.dynamicLinks().handleUniversalLink(url) { [weak self] (link, _) in
        guard let linkURL = link?.url else { return }
        self?.handlePasswordlessSignIn(withURL: linkURL)
    }
    return handled
}

func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
    if DynamicLinks.dynamicLinks().dynamicLink(fromCustomSchemeURL: url) != nil {
        // Handle the deep link. For example, show the deep-linked content or
        // apply a promotional offer to the user's account.
        return true
    }
    return false
}

func handlePasswordlessSignIn(withURL url: URL) {
    let link = url.absoluteString
    if Auth.auth().isSignIn(withEmailLink: link) {
            Auth.auth().signIn(withEmail: UserDefaults.standard.string(forKey: "email")!, link: link) { (result, error) in
                if let error = error {
                    print(error)
                    return
                }
            }
        }
    }
}

// AccountViewController.swift
@objc func unlinkMail() {
    Auth.auth().currentUser?.unlink(fromProvider: EmailAuthProviderID) { (user, error) in
        if let error = error {
            print(error) // found the error
        }
    }
}

This is my code.
And I also reproduce this issue on quickstart-ios/authentication/.
I wrote the steps above comment.

Are there any wrong steps?

I debugged the sdk, and I found two problems here.

firebase-ios-sdk/Firebase/Auth/Source/User/FIRUser.m

Lines 1255 to 1267 in 99ffc72

	if ([provider isEqualToString:FIREmailAuthProviderID]) {
	if (!self->_hasEmailPasswordCredential) {
	completeAndCallbackWithError([FIRAuthErrorUtils noSuchProviderError]);
	return;
	}
	setAccountInfoRequest.deleteAttributes = @[ FIRSetAccountInfoUserAttributePassword ];
	} else {
	if (!self->_providerData[provider]) {
	completeAndCallbackWithError([FIRAuthErrorUtils noSuchProviderError]);
	return;
	}
	setAccountInfoRequest.deleteProviders = @[ provider ];
	}

• _hasEmailPasswordCredential is always false. Maybe when Authenticate with Firebase Using Email Link, It doesn't have any password?
• setAccountInfoRequest.deleteAttributes = @[ FIRSetAccountInfoUserAttributePassword ]; is not working. I tried setAccountInfoRequest.deleteAttributes = @[ FIRSetAccountInfoUserAttributeEmail ]; . It works

I feel it seems to be sdk bugs. Do you have any idea?

[renkelvin]

Fixed here: #3442

Thank you for fixing it, I found no error when I unlink email auth on iOS device.

But after I unlink email with this pull-request, I found the email auth on the firebase console, and I can log in with the email again. It seems to be not unlinked correctly.

Is it still fixing ( the server-side)?

[renkelvin]

Yeah, the server-side fix will be rolled out when Firebase v6.6.0 is released.

[paulb777]

@renkelvin 6.6.0 is now published. Please confirm the server side fix has rolled out and close.

[renkelvin]

Unfortunately, the backend fix is delayed. I'll update here once it's available.