why do I get “Invalid appsecret_proof provided in the API argument”

Question

Since the latest change on Facebook, regarding the appsecret_proof: https://developers.facebook.com/docs/reference/api/securing-graph-api/, we are still unable to download p

Answer 1

Another potential cause of the "Invalid appsecret_proof ..." error, is a user access token that is not associated with an app. If you are generating a user access token using the graph explorer, make sure to select an app from the dropdown on the top right corner. Otherwise, you will be generating tokens that only work within the graph API explorer.

I filed a bug with the Python SDK before I caught my mistake. GUIs are the devil.