Activation is for the US and SG region, other regions are not guaranteed.
They are NOT suitable for any other services and have no balance.
You can use these only for activating Xbox game pass trial codes (14 days, 1-2-3-4-5-6-7-8-9-10-11-12 months).
If you have already entered your card and received an error, then there is a high probability that you received a shadow block. Try to link the card to a new account, card cannot be refunded.