You must have:

  1. In PingOne, go to Applications > Applications.
  2. Browse or search for the Microsoft 365 application and click the Microsoft 365 entry to open the details panel.
  3. Click Enable Advanced Configuration and click Enable when prompted.
  4. In the Configuration tab, click the Pencil icon.
  5. Select the Enable Kerberos Authentication check box.
  6. Click +Add Gateway User Type.
  7. Select a Gateway and a User Type.
  8. Click Save.