I've gone to the CU site and visited the area where I see transactions, AND can manually download a Quicken file to import. There are no visible changes to the process of getting there and there are no popups or other requests for information or actions. I've cleared cookies and cache. I've reloaded backups and tried again. I've deactivated and attempted to reactivate. Nothing seems to correct this issue for me. Note: a new release of Quicken loaded this morning just before the issue occurred.
Windows Classic Deluxe
Windows 10 22H2 build 19045.3930
Quicken Version R54.16 Build 27.1.54.16