Hi @nitin-cfg,

I don't believe notifications are generally sent for the beta/test Canvas instances.  The How do I access the Canvas beta environment as an ... - Instructure Community - 111 guide explicitly says "Notifications, including course invitations and report downloads, cannot be sent in the beta environment."  If you absolutely have to use the beta environment and have different users there than in production, you may want to use the SIS Import functionality to create them.

-Chris