I have modified the environmental variable trough the postman desktop app. I have logged into the account. I have stopped payment after my work is done. Now the sync button is disabled in the app. Can you suggest me what can I do to get it to work.
Hi again @Dilleswar.tudip 
Could you please try to sign-out and login to the application and see if that starts syncing the application? I hope you are in the latest version of the application (Settings > Update).
If the issue persists raise a ticket to support from this link here or write to us at help@postman.com.