I am writing a service on Flask, in the role of front'a is React. On the server, I already configured oauth authorization through Google, as a result of which I get all the necessary user data. A problem occurred while trying to force the front and back to work together. I did fetch requests from front'a, but Google service throws out the error "no access token", the same error occurs after adding the front address to the list of trusted services in the office of my application on Google. What should be the scenario of interaction between React and Flask in this situation? Any advice would be helpful.

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