Um, tf? @Minecraft @MojangSupport @Microsoft

Try deleting your cache and use a different browser and/or device (if available), and ensure you have a good internet connection. You may also need to try disabling any browser addons/extensions that you have running. Let us know if you're still seeing this error! ^FF

Probably should've mentioned that I found the solution thanks to a mutual friend who works at Microsoft. But thanks anyway