Mac App Store not working on macOS Mojave 10.14 Beta 1 (18A293u)
With latest beta 2 update 10.14 Beta (18A314h) issue is resolved.
- Update macOS to latest 10.14 Beta (18A314h)
- Open App Store
- Click on Store -> Sign Out in menu
- Quit App Store
- Open App Store again
- Sign in
After this I could update apps and initiate new downloads.
macOS Mojave is currently in early beta phases. The stable public release is due in fall.
Such unintended behaviours may appear due to the nature of the release.