OAuth still returns 403 (error 415) even when callback urls are set


Hi there everyone

Became aware of the changes of oauth around the 12th due to production errors. Have since added all callback URLs to the app settings console but still unable to “Sign in with Twitter” and get 403:

<?xml version="1.0" encoding="UTF-8"?>Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings

I’ve checked, checked again, checked once more and tried different things but I just cannot get it to work. Any pointers much appreciated.

Many thanks!