There are several reasons that can cause this. Take a look at these first-

• You need to activate your license. If the license is not activated, the plugin won’t work. Please see this to know how to activate the license.
• You need to input the same Secret Key in all of your sites.

Share Logins setting page

• Make sure you have the same version of Share Logins Pro installed on all of your sites.

If you still need assistance, feel free to open a ticket here. http://help.codexpert.io/new-ticket/