Hi
Welcome to the Centrify community!
Couple things I have noticed according to your description:
1) SystemCACertificates is NOT needed to add into Keychain
Therefore, please first remove it from the Keychain first.
2) Also please remove the 2 old DoD certificates as well.
3) Once done, please access into the following website to download the appropriate DoD rootCA certs:
https://militarycac.com/macnotes.htm
Once done with the instructions above, please give it a try again and keep us posted with the result. Thank you!
BR,
Ivan