Alexa skill with two nabu casa accounts

Like to start using (testing) Nabu Casa, however with two HA implementations in separate houses and one amazon (Alexa) account I am not sure how to get that done as it seems I can only tie one Nabu Casa account to the Alexa Home Assistant skill. My intent was to get two NC accounts one per house, problem is they share the Alexa’s.

I have this problem and cannot see a solution - can someone advise please? I know this is an old topic and am hoping that it has been resolved