The title is not that clear. Do you perform a Leap 15.5 to 15.6 upgrade and want to use (snap) Skype afterwards? If yes, (snap) Skype should be still installed (when it was installed on Leap 15.5). You can list the available/installed snaps on your system via snap list
I’m inclined to agree that it’s been a piece of you know what. What else can I use in it’s place. Zoom works but none of my 80 year old friends want to switch.
Sorry, not here to provide a solution … but only to provide a different perspective.
I prefer using Flatpaks. If I fire up Discover, it’s about 3 mouse clicks and Skype would be installed. But yea, for me, Flatpaks over Snaps plus easier to install using Discover.
A surprise solution if anyone runs into the same problem. Skype runs successfully under Fedora, located at /var/lib/snapd/snap/bin/skype. I copied it to 15.6 and it runs smoothly.