What does the "Only valid bearer authentication" error mean in relation to Spotipy's Authorization Code Flow?

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The "Only valid bearer authentication" error in relation to Spotipy's Authorization Code Flow means that the access token used for authentication is invalid, expired, or not properly formatted. In other words, the API is expecting a bearer token for authentication, but a different type of token is being used or the bearer token is no longer valid. To resolve this error, you may need to generate a new access token or check that the token you are using is a valid bearer token.