Why can't I issue a partial refund on an order?

[Styrman]

I tried to issue a partial refund for an order, but keep receiving this error message: "Refund failed! You are not allowed to request refund."

I would appreciate any and all help to get the issue fixed. 🙂

[StephensWorld]

You'd want to reach out to your payment provider directly, for help resolving this. 

[Styrman]

I tried, but have not received any response from them. 😕