Hi isharma1498, We appreciate you reaching out to us. We understand that you are unable to add a card to the Wallet app.
It looks like you came from the article below. Have you had the chance to try all the steps in that article? Add, use, and share boarding passes, tickets, and other passes in Apple Wallet
If yes, we recommend that you check out the article below.
If you can't add a card to Apple Wallet to use with Apple Pay
Take care!