Stuck with Apple Card in the iPhone wallet. Cannot add or remove it because service is not available.

I'm trying to add or remove Apple Card from iPhone wallet.

When I'm trying to add it, the app shows message: Account Service Unavailable.

When I'm trying to delete this "Previous Card" from the app. It shows message: Cannot Delete Card. The card might have a balance or the issuer is offline.

Please help to solve this problem.