If anyone is still stuck here... Leave your EIN blank, it'll let you move on to the manual entry and won't crash.
Basically, it's trying to see if it can auto-load your W2. The API it uses is not functional anymore, and it does not have error handling to gracefully realize "oh, that system is down" so it just crashes when it expects and answer and instead gets a timeout (or a 503 response that isn't formatted the same way or whatever).
tl;dr: leave EIN blank and hit next, it won't crash
