The ability to "Merge calls" was available in Skype for Business. The ability to call one person, put them on hold then call a second person, and then merge the calls together just like it was on Skype for Business.
Why was this ability removed?
Shenil Pragji commented
The ability to merge calls was a great feature in SFB and allowed you to drag and this would convert into a conference call. Why has this simple functionality been missed in MS Teams?
I used to see this feature when I was at one of my client but now cannot find it anymore...can somebody explain