unable to sign into AppStore or to add a payment method
We got a new computer and created a new appleID to sign into it. Since the beginning I've been unsuccessful in trying to sign into the Appstore. I get prompted to enter my user name and password , then get the message this AppleID is used for the first time, I should review, I click on "Review", then get prompted to enter my credentials again, and this endless vicious circle continues forever. I read in other threads that the way out is entering a payment method under AppleID in System Preferences. However, in my case this seems to be equally impossible. Under Apple ID I click on the Payment and Shipping tab, the address I have previously saved is displayed, and I have the option to edit it, but not the payment method. There are no editing options for a payment method at all. In the field where the card details should be entered, it says "You have no payment method on file". Does anybody know how to solve this?