I'm following the method outlined here to extend tokens to 60 days:
https://developers.facebook.com/roadmap/offline-access-removal/
In other words, I call https://graph.facebook.com/oauth/access_token?
client_id=APP_ID&
client_secret=APP_SECRET&
grant_type=fb_exchange_token&
fb_exchange_token=EXISTING_ACCESS_TOKEN
with the current access token.
First time I tried this, it actually worked fine and the token was extended for 60 days. Now it doesn't seem to work anymore, even though several days have passed since the last time I requested an extension. You're supposed to be able to extend once every 24 hours if I'm reading this correctly...
...anyone else seeing this?