I try to submit a new version for an addon for signature and the validation failed with the following error:
Your add-on failed validation with 1 error
Received an empty response from the server; status: 404
… but it looks like the AMO dev team will need field this one, and as I understand it they’re mostly based in Europe.
I don’t speak for that team, so I can’t give anyone a time to fix, but they’re smart people with a reproducible test case and that’s usually all you need. I’m confident that this will be resolved shortly, thanks for bearing with us.