If you are developing azure bots you will need to register to channel / channels as well. But some features are not supported in all the channels. Please see the below link to check which features are supproted in which channels. For instance, buttons are supported in Skype channel but its not supported in Skype for business. You could also see a preview here
https://docs.botframework.com/en-us/channel-inspector/channels/SkypeForBusiness?f=AdaptiveCards&e=example1
https://docs.botframework.com/en-us/channel-inspector/channels/SkypeForBusiness?f=AdaptiveCards&e=example1
