Have the same problem. Had to replace a Z-wave plug with a Zigbee ( https://www.amazon.com/gp/product/B08LD7Q81J ). Seemed to go properly, as it added a ZB***** to the list. But when I try to On/Off, a popup occurs "Request Failed." Tried to right-click "Zigbee/ Synchronize/ Update" (and "> Update with Interview" ) the Plug/Light starts flashing, so I know it has some control over the plug, but I cannot get it to turn On or Off without the "Request Failed." Really need to get this working in my programs ASAP!
ADD'L: I've tried adding/re-updating with interview/ deleting/ re-adding these several times (I tried another one just in case the first was "defective") and now I just have the device(s) but nothing in the "control panel" of the AC (i.e. "On" "Off" controls .. just "Query" at the bottom which still results in "Request Failed.")
ADD'L: On/Off buttons and "Set Parameters" controls have now appeared again but still getting "Failed Request" whenever I try On/ Off/ Query.
ADD'L: "Toggle" and "Identify" buttons have now appeared also but still no control: "Request Failed." I would even try changing some parameters to experiment on getting control but I am clueless what to try.