Error validating access token
Or try the opposite and install a fresh copy of Drupal on your production hardware and see if FBOAuth works any better on that install, to rule out it being a module conflict.
You restrict access to your API service on Anypoint Platform by applying the OAuth 2.0 Access Token Enforcement Using External Provider policy.
If and only if the token is expired it is very important that the consumer uses the refresh token or starts a new flow to obtain a new valid token.
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I hope this helps -someone-, because it sure would have helped me 6 months ago.
Once a user has been authenticated, an access token is returned which can be used to call the Social REST API.