SEKM failing to communicate with KMS with unhelpful error messages

Seeking some guidance and assistance regarding an issue I'm facing while trying to set up SEKM on my PowerEdge server. My goal is to see and understand how SEKM works, so I don’t have any commercial KMS server and am instead using PyKMIP. I’ve configured PyKMIP with the necessary self-signed cert and private key, signed the CSR with the CA, and uploaded it to the iDRAC, but when I attempt to test the connection it tells me that I haven’t uploaded the necessary keys:

SEKM003: Unable to connect to any Key Management Server because the SEKM certificates are not uploaded to the iDRAC.
Make sure that the required SEKM certificates are uploaded to the iDRAC. For information about the required SEKM certificates, see the iDRAC User's Guide available on the support site.

I uploaded both the CA and the signed CSR, is there something else that I need?

I double checked using racadm that there is a SEKM cert:racadm>> racadm get idrac.sekmcert

[Key=idrac.Embedded.1#SEKMCert.1]
#CertificateStatus=NOT_PENDING
CommonName=iDRAC
CountryCode=US
EmailAddress=
LocalityName=*******
OrganizationName=******
OrganizationUnit=*******
StateName=********
SubjectAltName=
UserId=