You need two sites . One master, one any version On both master and the other site : Turn on Mnet at Site administration > Advanced features Go to Site administration > Networking > Manage peers and turn on "Register all hosts" On master only: Add the other site as an mnet peer at Site administration > Networking > Manage peers Click on the " Services " tab. Tick both " Publish " and " Subscribe " checkboxes for the " SSO (Identity Provider) " and " SSO (Service Provider) ". Enable MNet authentication at Site administration > Plugins > Authentication Install any other IDP auth plugin (e.g. Oauth) from the plugins db Enable in Log out View log in page Make sure you see the correct icons for both mnet and the other idp plugin Make sure to test the last step in both Clean and Boost themes