Curve card rejected by Transport for London as “unacceptable”! Not a major thing just minor nuisance.
Works fine for me!
I tried it several times it is for my congestion charge account.
Could be the processor TfL’s contractor (Capita) uses for that (or even Capita itself) doesn’t accept Curve.
Try readding the car, I kept having similar issue until I readd it. I cannot remember if there was a button to verify the card or that was for the TfL using the card as an oyster.
Happened to me the other day. It worked, then stopped. Nothing I did helped. Switched to another card in gpay.
I had a similar problem with Transport for Cornwall