I have a configuration set up for my app in Facebook which uses 'user access token' and this works fine, however, I need continuous access to my users' accounts so I switched to 'system-user access token' and now, whenever the login popup shows, I get the following error :
"It looks like this app isn't available"
The permissions are exactly the same and its the same app, just a different configuration. One uses 'user access token' and works fine and the other uses 'system-user access token' and doesn't work.
I've tried everything I can think of but for the life of me can't find the problem. Can anyone help? Thanks!
In our case, it started working after setting
response_type=codein the authorization URL.