@srinivas, I assume you are looking to enable end users to sign in with their AAD accounts and have access to organizationally managed skills using Cortana? Or you are looking to build and maintain your bots with a Cortana account?
We are working to improve Bot Framework integration across a wide variety of channels, including enhancing support for existing channels such as Cortana. Please review our docs for updates – https://docs.microsoft.com/en-us/azure/bot-service/bot-service-manage-channels?view=azure-bot-service-4.0
This topic is under review, and we will provide periodic updates.