Effective May 5, 2022, Duo is blocking access to its service when accessed from countries or regions subject to U.S. economic sanctions and some countries, such as Sudan, that are no longer subject to sanctions. The countries/regions where Duo is restricting access, effective May 5, include:

• Cuba
• North Korea
• Iran
• Sudan
• Syria
• Ukraine – regions including:
  • Crimea region
  • Donetsk region
  • Luhansk region
  • Sevastopol region

Users in these regions will see a Duo error message: “Access denied. Duo Security does not provide services in your current location.”

See this Duo help article for more details.