Sign Up page shows Error in Test mode. I think the DB connection somehow is not working

Hi All, I am a developer but I am new to app development. I used flutterflow flows. When I try to signup I see an error message at the bottom in test mode. I set up the firebase db. I do not see any errors in my project as well. Can someone help me with this.

I see this on webpage: Failed to load resource: the server responded with a status of 400 ()

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