Starbucks App Rejects Virtual Card with "Account Not Linked to Merchant" Error

Today, whenever I try to add my virtual card via Masterpass on the Starbucks app, I keep getting the error "Account is not linked to the merchant," which prevents me from loading funds into the app from my card. Despite trying multiple times, I encounter the exact same error every single attempt and cannot complete the transaction.

I want to add and use my virtual card seamlessly through Masterpass on the Starbucks app and reload my account balance without issues. I request that you investigate the cause of this error, re-register my card or account in your system if necessary, and resolve my issue as soon as possible so I can make smooth transactions with Masterpass through the app.