I have found the resolution. Geolocation can only be used in HTTPS requests. In order to convert your localhost flask app to HTTPS from HTTP, you have to use OpenSSL to create a key and certificate.

Follow the below step to set up your HTTPS environment for the flask localhost server

• If you have installed Git then OpenSSL command comes in a package. Open git bash where you want to store the files.
• Run the below command in Git Bash.

openssl req -newkey rsa:2048 -nodes -keyout key.pem -x509 -days 365 -out certificate.pem

• Change your app.run() method in python script to below

context = (r"{path}\certificate.pem", r"{path}\key.pem")
if __name__ == '__main__':
    app.run(host='0.0.0.0',port=5000,debug=True,ssl_context=context)

path refers to the location directory where the key and certificate files are stored.