I'm on a new Mojave install and I can't install updates to Apple suite programs (Garageband, Pages, Numbers, Keynote and iMovie). I've updated macOS and Xcode command line tools successfully from the Software Update app. When I open App Store, it says that I'm not signed in. (Logga in means Login in Swedish).
I try to login, but each time I enter my Apple ID password it just loads and exits the login prompt, without switching to logged in state. Note that I've logged into iCloud and iTunes successfully.
When I try to update the outdated apps. The circle loads for some minutes, and then the
Update button returns.