Adding this to another post as well, as I’m hoping someone else finds this as useful as I did…
I reached out to support and they helped me resolve my issue. Below were the exact steps. Took several tries, but everything is working now without having to delete any devices or rules. Note that per the steps below, it doesn’t actually add any devices in the “add a new thing screen” and the add device screen won’t update, it will continue to pinwheel and say looking for devices, but the already added device came back online for me after power cycling a few times. Hope this helps someone else!
Here are the steps:
"What I am going to have you do for any future and current offline devices is to perform a “rejoin” of the device. A rejoin basically tells the device to look for the best possible connection for that one device as opposed to the “z-wave network repair” which tells all devices to look. I wouldn’t do any more repairs at this point as that resets all the connections that this rejoin will repair.
Here is how to do a rejoin of offline or non-working z-wave devices:
First, put the Hub in inclusion mode. Do this by tapping on the “My Home” tab, going to the bottom of the “things” list, and then tapping on “add a thing”. While it is in this “looking for devices” screen, go to step 2.
On any device that is offline, please simply switch it on and off a few times. Start with the devices that are closest to the Hub first. This should get the device to show up again as online and should get it to find a new connection point to the Z-wave network. Please repeat this for any devices that fall offline or do not respond to commands. Make sure to not do a Z-wave network repair as it will break these new connections. Once finished rejoining a device, exit the “add a thing” screen and see if the device responds and is online after about 20 seconds. Note: you will not see any devices getting added on this “looking for devices” screen, it is simply used for getting the Hub in the right mode.
Go ahead and try that out for any of your offline or non-responding devices and let me know if you are having issues getting them back online."