I tried the suggestions from Here, and it didn’t work for me.
The build version is 2.1.523, after the update.
After tablet restart, I can try to log in. I go to an app, try to purchase, the “log in” prompt appears. I press “log in”. It redirects me to a web-site for the login. I tried both with google and with username+password. In either case, after submitting my data, the system goes back to the appstore application and keeps prompting me to Log In. I cant purchase anything.
Any insight is welcome, probably I’m doing something wrong, or skipping that one single silly step that I overlooked…