Automation Controller fails to pull execution environment from private automation hub

[parmstro]

Error: initializing source docker://ah1.example.ca/rhis_example_ca_ee:latest: pinging container registry ah1.example.ca: Get "https://ah1.example.ca/v2/": x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "Ansible Automation Platform")

This appears to be a result of:
https://access.redhat.com/solutions/6707451