Exemplary error message: 

Possible Solution 1: Ensure access to API

Please make sure that the following two URLs are accessible and are not blocked by e.g. a firewall:


Possible Solution 2: Clear Outlook Cache

  1. Close Outlook 
  2. Start Internet Explorer 11
  3. Press STRG + SHIFT + DEL to clear the browserhistory
  4. Select "Temporary Internet and website files" and "Cookies and website files" and confirm "Delete"

  5. Restart Outlook

  6. Test SoSafe Button again


Alternatively - for newer versions - please click on the white area when the Add-In is open and press F5 to reload.



Solution 3: Activate protected mode

  1. Close Outlook
  2. Press the Windows key + R
  3. Enter "inetcpl.cpl"
  4. Select the "Security" tab
  5. Check "Protected Mode" for the "Internet" and "Restricted Sites" zones
  6. Restart Outlook
  7. Test SoSafe Button again