Making my transition from ST, and 2/6 of my Innr 224 plugs will not repair after being removed from smart things. I have factory reset these multiple times and don't know what to do at this point. All my other outlets and switches moved over just fine?
What Zigbee channel is your Hubitat using? How about the old ST hub? Most find Zigbee channel 20 works very well, and avoid 2.4GHz WiFi interference (as long as you use 2.4GHz WiFi channels 1, 6, or 11 with 20MHz channel width).
Do not use Zigbee channel 26, as it is max power restricted by FCC rules in the USA.
I'm having the same problem with an SP234 plug that was previously on my network and stopped responding. I was able to get it to the point where the switch thinks it's on the network and paired (the green light stopped blinking but hubitat doesn't agree).
One I was able to update, the second I can't even get it to be acknowledged and is totally unresponsive to hubitat - it joins, but nothing happens. I've contact INNR for a replacement.