I had the same issue purchasing Audit Defense, can't enter any expiry date after 10 (October). I called Telephone Support today and this issue wasn't fixed - it's over a month since the last update on March 6, 2026.
I was told use another credit card, but I need to use the one I'm using to get a $15 statement credit from the card issuer. Turbotax won't honour that and just told me to use another credit card. Not using Turbotax next year after this experience.
