You might want to disable authentication to start with. You can verify that authentication is off on the EMS side by looking at the "authentication" section in the config/config.lua file. You can remove it or comment it out (– for each line, or –[[ and ]]– for comment blocks).
If you have already done that, what errors are you seeing when you do the push? If you run the EMS as a console app, does it give you any indication it is receiving a push? If so, does it display any errors?