I excluded my Aeotec Smart Plug for ST, then Discovered on Hubitat. It said device found, but never initialized. I've tried multiple exclusions on Hubitat, fail, ST still says it's successful, but it won't rejoin.
I have a couple of various outlets that used to be on ST
I had to run a general exclusion on ST a couple of times before I could initialise them on HE
(Even though I had deleted & excluded from ST originally)
I wonder if it's a bug. I got an Aeon Minimote that was still paired to SmartThings, switched it over to Hubitat but it was a PAIN to pair with hubitat. I tried to pair it to SmartThings and it detected immediately with no pain. I was able to get it paired to Hubitat after a few attempts. Although I'm starting to wonder if the Aeon Minimote is just showing its age.
Secondary controllers pair differently in HE. There's a writeup i did on how to pair them, which applies to any device thats joind as a secondary controller.