not sure what the problem is.
I'm on single site.
im the only user
i'm on current versions of plugin and WP
i have installed via ftp without errors and used the dev dashbaord (which gets hung up alot, i'll be surprised is this question actually gets posted tbh)
i've deactivated reactivated
i've set file permissions
i've cleared cache
i've tried different browsers
the user account shows membership key
capabilites show: membershipadmin