I expect Microsoft are using the UN region names for Europe, where Britain are Ireland are part of Northern Europe.
https://en.wikipedia.org/wiki/United_Nations_geoscheme_for_E...
The UK names still aren't great, even if they sound reasonable in isolation (Cardiff - West, London - South). They have fixed the map though.
The UK names still aren't great, even if they sound reasonable in isolation (Cardiff - West, London - South). They have fixed the map though.