Hi @pradeep_07,
This seems to be a timing issue. The eVar value is not present when the Launch rule fires but when the page load is complete probably eVar is firing at that time. Due to this _satellite.getVar s giving you the value in the console window. So, I will suggest you to please try changing the load order of your library at Page Bottom or on Windows Loaded.
Hopefully, that will resolve the issue.
Regards,
Abhinav