Cloud Version Won't Open

Hello,

As a longtime user of MuseScore, I was apprehensive to connect drafts to my online account, as I always believed the safest place for my personal work is my personal computer. I gave the cloud a try after MuseScore 3 became inoperable with the previous update. Now, the app refuses to open the cloud version (which is the only MS4 version, despite the two-year-old project of the same name beside it) and I'd like help rectifying that.

Attached are screenshots of the "invalid" popup.