I no longer use Polo for some years, however, the app seems to work from my location. And the website too.
Prohibited Countries
Afghanistan, Burma, the Chinese Mainland, Crimea, Cuba, Democratic Republic of Congo, Iran, Iraq, Ivory Coast, Libya, Mali, North Korea, Palestine, Somalia, Sudan, Syrian Arab Republic, Yemen, Zimbabwe, the United States and all US Territories (such as American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and US Virgin Islands).
Prohibited Countries for Futures
Afghanistan, Burma, Burundi, the Chinese Mainland, Crimea, Cuba, Democratic Republic of Congo, Iran, Iraq, Ivory Coast, Libya, Mali, Morocco, North Korea, Palestine, Somalia, Sudan, Syrian Arab Republic, Yemen, Zimbabwe, the United States and all US Territories (such as American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and US Virgin Islands).
OP, please takes a look to this list. Is your location in there by chance? If so maybe you should
try your luck with a VPN or proxy and get your money out.
If your country is not on the list, maybe try from another device / internet provider...?