NB to resolve this, I noted that my partner still had a Google Home set up in Google, associated with an old TP Link Home, so I unlinked the TP Link association from their old Google Home, deleted...

@Goattee am I getting the same as you? I can say "turn all the lights off" and it'll say "Sure, turning 2 lights off." (even though I have 5 lights) and then "sorry, I couldn't reach TP Link Kasa"....