Same here. I had thought that I had corrupted my appliance some how, checking daily to see if it was still broke or if something had been fixed. I've tried multiple browsers, checked multiple appliances, and am seeing this message on all of them.
Hoping that someone on the suse-studio development team can confirm they are looking into the issue and attempting to resolve.
I have projects relying on this appliance-build functionality and have quite a few modifications queued up in notes/etc to build a new version of my appliance.