How do I connect my project to Firebase?

Can anyone tell what this error means

I’m not sure but you could watch this video and make sure you’ve done all the steps:

Also, I Googled error code 400 and found this:

Error 400 is related to the client-side.

Your code should work correctly so most likely the issue is that you have not yet enabled the Sign-in method under Authentication in firebase console.

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I got the error