Oauth.io domain not authorized even though I've whitelisted it on oauth.io

Question

Edit: this is my first post, sorry if I make any noob mistakes!

I'm getting this error:

Error: Origin "http://cntxt.github.io/" does not match any registered domain/url on oauth.io
    at Object.sendCallback (...oauth.js:669:15)
    at getMessage (...oauth.js:172:36)

But on my oauth.io app, I've whitelisted the following:

I whitelisted them all about 12 hours ago, but I suppose it could take more time than that. This seems like it should be fairly straightforward, which is why I'm confused.