Q: app store problem

Your AppleID and the ID used for the App Store are not necessarily the same.  Sign out of the iTunes/App store and re-sign in using the proper ID.

Are you also being prompted to login and review the account ? If you are have you done so, and if required enter payment details ?

And have you done that, you've logged into the account and if prompted entered payment details ?

Unless you use these instructions when creating a new account : Create or use your Apple ID without a payment method - Apple Support

payment details will need to be entered before the account can be used - you should be able to remove them after entering them.