Flask Cors not working from Angular APP in python3.10 and macOS

Question

I have read almost all the questions related to flask and flask_cors, and still I have not figured out what is going on.

I created an app with an angular frontend and flask in the backend. It worked perfectly with python3.8 and Ubuntu as the operative system of the computer.

Now, I moved to macOS and python3.10 and the CORS do not allow me to make the requests.

The backend:

...

from flask_cors import CORS
...


app = Flask(__name__)
cors = CORS(app)

The only "weird" thing to take in consideration is that I have added a decorator to check the token in every request as follows.

class Auth:
    def check_origin(function):
        @wraps(function)
        def wrapper():
            try:
                ...
            except:
                return Response.error("Origin not recognized", 400)
            return function()

        return wrapper

@app.route("/question", methods=["GET"])
@Auth.check_origin
def get_questions():
    ...

Thank you for reading!