Unfortunately, in general, our banking partners will refuse to accept payments from websites that specialize in gift cards (for your employees or customers) when the merchant's activity is detected.
In fact, they block these types of payments because they don't want their service to be used to buy money online (this is part of their contract).
We hope this won't be too much of a blocker for you. 😔
If the option is available on the merchant's website, you can try using Paypal: add your Spendesk card to your Paypal wallet, and then select Paypal as a payment method on the website.
You can also retry making the purchase with a recurring card (if you've been trying with a single-use card) or retry on other websites: in some cases this has worked 💪 !