Follow the guide Using NPS with Cisco IP Phones
https://social.technet.microsoft.com/Forums/en-US/6d78c698-a087-48cb-bc73-9566aa61bf10/using-nps-with-cisco-ip-phones?forum=winserverNAP
I have enable 802.1x on NPS using MIC certificates, but still get error code 22 on NPS event viewer, does anyone can help to clarify if NPS can authentication success with Cisco IP Phone?
Erin