Unable to run Zoho Desk in Dev Mode | Telephony bar is not coming Even after uploading a private app

Unable to run Zoho Desk in Dev Mode | Telephony bar is not coming Even after uploading a private app

I am unable to run Dev Mode using command runDevMode() in zoho desk.
And on opening the connection Page i.e., https://zapps.zoho.com/zapps#apps/dreconnectors?service=desk It redirects to the login Page. And on Providing login credentials it takes to the https://zapps.zoho.in/zapps#apps instead of the connection page.