Amex platinum business card

Hi guys,

so i applied for amex platinum business card and it doesn’t have a limit but it says on the paper “you have to check the spending power before you spend money” the issue here from the first week when i put an amount in the spending power even if it’s just 50£ it says “we can’t offer you this amount or something like that” and to be honest im stuck on whats going on ! I do not want to pay 650£ per year for a card won’t allow me to pay 50£ !!

Have you encountered a problem like this before?