Just wanted to mention that sometime in the last few days a brand-new official smart app, “harmony control” (not “harmony connect”) showed up in my account all on its own and broke my harmony/SmartThings integration. It appears to be a replacement for “Logitech Harmony triggers”
It did assign itself to my trigger switches, but I wasn’t signed into harmony from its credentials page and so nothing worked.
It may have been somebody in support pushed it out to me as I have a couple of open tickets. But I did just want to mention it because it was a hard problem to track down but easy one to fix. Details here: