3rd Party certificate chain broken

[keebs]

I created a pfx with openssl that I imported into MeshCommander. If I open that certificate in Windows, I can see a valid certification path. Now I connect to AMT and issue a cert with that same certificate. If I view the certificate properties, the common name of the issuing certificate matches the pfx. But if I download the certificate and open in WIndows, the certification path is broken: "The issuer of this certificate could not be found."

If I begin with a root cert generated in MeshCommander, the certification path is not broken.

The Root CA generated by MeshCommander and the PFX certificate are both 2048bit Sha256RSA

Please help!