Fixing 403 error on SaltStack Config 8.6 integrated with vRA and vIDM

I've been wanting to learn a bit more about SaltStack Config so I recently deployed SSC 8.6 to my environment (using vRealize Suite Lifecycle Manager to do so as described here). I selected the option to integrate with my pre-existing vRA and vIDM instances so that I wouldn't have to manage authentication directly since I recall that the LDAP authentication piece was a little clumsy the last time I tried it.