Problem with Membership 2 Pro failing to assign custom user role

I’ve installed the Membership 2 plugin on (a multisite, multinetwork build). The build has several custom user roles – Storyteller as one example. I wish to assign role(s) upon membership subscription, and have set Membership 2 to do so (giving the Storyteller role when one joins as a Storyteller member, for example) but the specified user role is NOT assigned upon successful registration.

Join page is currently omitted from nav, but can be reached at

I’ve tried switching off plugins, reverting to default theme, all to no avail. Thoughts?

I can provide admin account/pwd if needed for troubleshooting. Thanks in advance for your assistance.