UPS not working in Magento

Hello,

I am trying to configure UPS for Canada origin, but no matter what I do it always return “This shipping method is currently unavailable. If you would like to ship using this shipping method, please contact us.”

I changed currency to CAD, UPS Type to XML, All Shipping methods selected etc… whatever I found on net. But nothing worked.

I doubt if this UPS option in Magento working at all?

Can anyone help, please?

Thanks!