The new app works for me. You have to let the Harmony smartapp stay open for a minute before new activities are discovered . Then you are able to select them to be added. 
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For me the new app did have the older Harmony activities that I had done a while back before Samsung removed Logitech from the list of Devices and they took away the ability for the new app to sync with Harmony.
The old SmartThings app still can link to Harmony to you can add new Harmony activities to your SmartThings account and then use them in the new SmartThings app, at least that’s my experience.
where are you looking? go to the menu (three bars in upper left of screen) and choose SmartApps. Logitech should be listed there.
If you are clicking the + in the upper right and choosing Device, that was only a way to add the loitech smartapp to ST. They removed that 11 days ago. But the existing logitech app is still available from my instructions above
Thanks, I did just see it like you mentioned it but did not try it so as not to potentially corrupt what I just got via the old app – if it aint broke don’t fix it……
The new app did have my old Harmony stuff, now I can also get the new. Thanks again.
Funny that no tech’s at SmartThings were aware of this way to access it and that the old app does have Logitech listed. I got a few emails from various SmartThings folks (Samsung folks) who simply said support has been stopped, no reason given even after multiple requests about this. So it goes, so much for “tech” support. Hopefully SmartThings/Samsung won’t see our posts and withdraw support……
Richard
FYI I had the same issue. I tried to add SmartThings to Harmony before I had any SmartThings devices enabled.
To fix it, I added a device in the SmartThings app (a virtual switch in my case) then in the Harmony app went:
Hamburger Menu
Harmony Setup
Add/Edit Devices and Activities
Here I saw SmartThings as an option again
I clicked it and clicked “Re-Login”
Did any body find a fix for this
thanks