It would be extremely helpful if you could say:
What version of Qubes you are running.
What template is used by default-mgmt-dvm.
What command you used to run the state.
Can you now run; qubesctl --skip-dom0 --targets=TEMPLATE --show-output state.apply qubes-ssh-agent.configure_template
replacing TEMPLATE with the name of the template, and post the output.
In general it is always a good first step to run a failing command with --show-output.
I never presume to speak for the Qubes team.
When I comment in the Forum I speak for myself.