In disconnect environment the HCP ignition-server is deployed with the incorrect image in the flag registry overrides, so when the ignition-server is trying to generate the payload is not able to get the manifest of the image because it tries to use the public registry instead of the mirror registry. 

OpenShift 4.14, MCE 2.5

Only at customer cluster at the moment.

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ignition-server tries to get the payload image from the public registry in a disconnected environment. 

ignition-server should use the mirrored image for generating the payload.