Earlier quoted context omitted.
Try using a Plus Code? The link you sent is 9C9MRJ9C+XP (visible in the left panel of Google Maps when you click on a location) which isn't on land and is rejected by the Starlink website, but "V84R+RR Isle of Scalpay" (the nearest land) gives me the same pricing as I see for my location in Edinburgh. So I suspect you'd be fine.
Thanks, I sent the wrong link (updated) The plus code for my area returns nothing, however for a satellite that is ~500km above me, surely subscribing to a location that is 27 miles away from me won't make a difference?
As an aside, plus codes should be wonderful things but the tooling isn't particularly well built out -- this is the first application I've seen using them that's not Google Maps, and it's not worked as well as I'd hoped it would :(. In this case, the geocoder for the area hasn't done what it ought to have done. And I fear that while the full codes don't need a geocoder, short codes might be generally susceptible to incompatible geocoders leading to incompatibilities between implementations. Which is what we seem to be seeing here.