Twitch posting not working

I tried making a twitch post on /supportsmallerstreams and got the "Sorry, we couldn't process your post. Please try again later." error.

I tried a few different twitch URLs on that community and then I tried making a twitch post on /destiny. No dice either place.

It is also unrelated to the include twitch chat option, as the same result was reached with it checked as was reached with it unchecked.

Making a link post to one of the same twitch URLs tested worked just fine, so it's not a URL problem.

Twitch posting is allowed in both of communities in which I tested.

I tested post origination from the home page and from the community page. No difference in outcome.

Desktop, Win7, Chrome