You are not allowed to access or use the services of Abra International if you are located, incorporated or otherwise established in, or a citizen or resident of: The United States of America, Cuba, Iran, North Korea, South Sudan, Sudan, Syria and Ukraine.
Source:
https://www.abra.com/Seems like the US residents should not be able to use their services though. How could OP use this service then? Did they update their policies or they failed to KYC their user properly and just allow everyone to register?