I am able to create and access the buttons on Skype (using HeroCard) and its working as per expectations.
The same code is expected to be deployed on Skype for Business as well. As per the investigation done (see link - https://docs.botframework.com/en-us/channel-inspector/channels/SkypeForBusiness/ I should be able to access the buttons on skype for business as well). However the link - https://msdn.microsoft.com/en-us/skype/skype-for-business-bot-framework/docs/overview says that buttons are not supported in Skype for business. Can anyone clarify/assist over the behavior.