Need a Nodejs and firebase expert to solve 403 and CORS error

Attached is a video explanation of the problem .

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Some one who can come in zoom/ anydesk/ teamviewer and solve the issue as I cannot share [login to view URL] money to the real expert. My budget is not more than 100 USD

Skills: Node.js, JavaScript, Google Firebase

About the Client:
( 100 reviews ) Bangalore, India

Project ID: #34030259