"Browser or app may not be secure. Try using a different browser." error with Flutter Firebase Google Login

Question

I am using flutter web and firebase authentication to build a web app. For that 1. Created Firebase app with Google signin as one of the sign in methods. 2. Added the dependencies as given in https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_auth/firebase_auth/example and https://dart-pub.mirrors.sjtug.sjtu.edu.cn/packages/firebase_auth_web.

When I try to login, the Google sign-in window appears. Once I enter the email address and press enter, it gives the following error.

"Couldn't sign you in This browser or app may not be secure. Try using a different browser. If you’re already using a supported browser, you can refresh your screen and try again to sign in."

I used Chrome browser. What should I do to make my app more secure ? For android, we had the option of using SHA keys to encrypt the connection. Do we need to do something similar for web ?

Solution 1

The issue was with the chrome developer version Flutter use to launch as a device. If we open the same URL (localhost:portnumber) in the normal chrome, it will work without any issue.

Solution 2

Incomplete answer:

This problem isn't specific to flutter. It happens whenever you try to sign in to Google in a Chrome instance that has debugging turned on. In other words, if you, your automation software, or IDE starts up chrome with a command like chrome.exe --remote-debugging-port=9222

If running Chrome normally (out of debug mode) is not an option, then try https://support.google.com/accounts/thread/22873505?msgid=24501976 or if you are using Electron then try https://support.google.com/accounts/thread/22873505?msgid=24503570 but I, personally, haven't been able to make these work for me, yet.

Please upvote the question at https://support.google.com/accounts/thread/25209002 if you want a solution to this problem that actually works.

Solution 3

The following worked for me:

Go into your google account

1. select Manage Account
2. Security
3. Less secure app access (need to scroll down a little bit)
4. set to off

Then I was able to login in and debug in IntelliJ

(for me, for some reason, I had to create a new google account, couldn't get it working with my existing account but it worked with my new account)