All device handlers got broken overnight (3 June 2020)

Not sure if this is related or not, but last night I realised that I’d stupidly deleted the classic app from my iPhone during a tidy-up, and as I needed it to sort problems out, I tried to reinstall it.

As soon as I log in now, it displays the message “Available countries could not be fetched from the server” as shown below. This seems to persist today - and I get the same on my iPad too.