This might be useful.
As I’ve understood it, it’s a very simple fix to whitelist a callback URL if you already have one set:
Simply log in to apps.twitter.com with your Twitter developer account, select your app and click on the Settings tab.
Scroll down the page and click on the checkbox to enable the setting “Enable Callback Locking (It is recommended to enable callback locking to ensure apps cannot overwrite the callback url)”
Click on the Update Settings button
If done correctly, your settings will be updated as below on the Details tab:
My question is:
- is the above correct? If so, how long should it take for the changes to take effect and for ‘Sign in with Twitter’ to start functioning as normal? Many thanks in advance.