Using workflow in approval policy

I've installed 3.7IG, then subsequently installed reporting and workflow.  I can access the workflow console and create new flows and forms, etc.

What I cannot seem to do is select "workflow" as the approver in IG, when I'm looking at an approval policy.   The docs (https://www.microfocus.com/documentation/identity-governance/3.7/user-guide/t4h0onhciawa.html) suggest that that should be possible.   Am I missing a config item, or did I miss a step in the install?   I do have external workflow config and URL in place in configupdate.sh.   Any thoughts?

--Jim