Domain Mapping Global login not working

I'm switching to WPMU Dev's domain mapping plugin. I'm doing it to see if it still has the login vs. ajax problem that the alternative plugin has from the repository.

Right now I'm stuck with not having any kind of remote/global login. I've removed the repository plugin for the time being and am working to get WMPU's working. I understand that there is a cookie issue, so I've cleared all cookies and logged in again to the main site. That login does not transfer to the mapped site when navigating to it.

Is this the default functioning and how do I change this?

As a note, I'm working on this to see how well your plugin performs with this issue: https://premium.wpmudev.org/forums/topic/ajax-and-domain-mapping-dont-play-well-together

This is because MarketPress heavily uses ajax and in order to offer the best services to market owners, I need to offer mapped domains, working ajax, and global logins for the network.