what sort of errors? like using a card or something?
pro tip for those unaware: if you buy gift card codes through Amazon, you get the bonus VP too and you don't pay taxes like you would if you bought them through the Valorant client
It might be an internal issue with the way Riot handles transactions. The obvious answer is to give it a day and see if it fixes itself. If you'd rather not wait, I do think doing the gift card approach will work since it's not a transaction, just entering a code