The last time we ran into something like this, it was because of an issue with CloudFlare and blocking specific IP(s). But it doesn’t look like that’s the case here, and you haven’t hit any of our blocked IPs that I can see, so I’m not sure.
Let me take a look through the logs to see if I can dig up why.
EDIT: …and we’re back! Do you want to give this a go now to see if it works?
I’ll try it with that device tomorrow, I just shut it down, and I’m on the MacBook.