I am unable to make calls from Mac even after using the same incloud and FaceTime account. please help

Hello bhargavi208,

To make FaceTime calls on your Mac, you'll want to make sure you're signed in. You can learn how to do that here: Sign in to or out of FaceTime on Mac - Apple Support

You can learn how to make a call with FaceTime here: Use FaceTime on Mac - Apple Support

If you want to iPhone cellular calls on your Mac, you'll need to also set up continuity. You can learn how to do that here: Make and receive phone calls on Mac or iPad - Apple Support

Thanks.