I think that I have followed the instructions to whitelist our iOS app but I keep getting 403 errors. I have enabled Callback Locking, updated the callback URL to be [appName]-twitter.[rest of URL]. I have read the documentation, but I still cannot log in to our app via Twitter.
I also made the changes close to 24 hours ago, so whatever changes should have had enough time to propagate.
Am I missing any steps or instructions? This feels very opaque to me.