1. Click the Gear at the top right of Internet Explorer>Internet Options>Security
  2. Click the Trusted Sites Icon, and then click Sites.
  3. Add these sites:
    1. signin.blackbaud.com
    2. blackbaudinc.auth0.com
    3. sky.blackbaudcdn.net
    4. s21aidntoken00blkbapp01.nxt.blackbaud.com
    5. login.blackbaudondemand.com
    6. https://*.blackbaud.com

Please have your IT department whitelist the Blackbaud.com IP to resolve this issue