Can't add my Middle Class Tax Refund VISA card into my iPhone's Apple Wallet?

After taking a photograph, fixing its OCR errors, entering the rear card's security code, and submitting, it said "Card Not Added -- Contact your card issuer for more information..." Retrying it fails again with that same results. I got two e-mails from ****@solspark.com showing "Your card was attempted to be added into a wallet. Your card ending with [deleted #] has been attempted to be added to the Apple Pay wallet..." So, it was attempted, but why did it fail? This was in my updated iPhone 12 mini's iOS v16.2.

I had no problems using this physical card yesterday with a local ATM yesterday and adding $10 to my Apple account as a test (instant). shows pending for that $10 so card does work.

Is anyone else having this problem too? Thank you for reading and hopefully answering soon. :)

[Edited by Moderator]