I didn’t do it exactly like that but will try now.
I moved the ST hub to be in close proximity to the fan controller using an ethernet PowerLine adapter and an extension cord. That should remove any proximity variables from the equation.
Just tried it again exactly per instructions. Still nothing.
I then remembered seeing a post by @JDRoberts where he mentioned something about letting Zigbee devices stay off for -15 min before “rebuilding” a Zigbee mesh. Maybe the Zigbee “innards” need to be powered down long enough to forget about their prior relationship with the Wink hub.
I have the breaker controlling this fan in the off position now and will re-test in 15-20 min.
Tried again with no luck. It looks like I am going to have to take the fan down in order to figure this out. Perhaps a HD remote is necessary in some cases after all?