Hello @coffee2code!
I would also like to state my interest in this app. I am trying to use it on a multisite network running the most current version of WordPress. It is installed, activated and configured at the network level for all sites, however, when I go to one of the network sites and try to register a second user, it says the email is already taken.
Should this be working on a multisite network as is, or is that not supported?
Thanks so much for your plugin. If I can get it working it will do exactly what I need it to. Take care!