Stay Logged In With Domain Mapping

I am having an issue with the browser not staying logged in on mapped domains when switching between sites. I have researched this a lot on the forums and other places and still can't seem to find a solution. I would like it if it would not ask for a login when admins switch between sites they are admins of.

I followed all the instructions and read all the documentation when setting up the plugin.

The hosting provider I am using is WP Engine. I know they have a bit different wp-config file and was hoping for a solution to the issue. I was looking for a DEFINE COOKIE line in the wp-config and do not see one.

Thank you.