Getting ZoneId from GetMapInfo

[Firesong]

Hello all,

I am new to WoW Lua and having issues with getting Zone Ids.

The documentation I am using is here: https://wowpedia.fandom.com/wiki/API...BestMapForUnit

This is the code in macro form:
/run local mapID = C_Map.GetBestMapForUnit("player"); print(format("You are in %s (%d)", C_Map.GetMapInfo(mapID).name, mapID))

When I do this in Northshire the output is "You are in Northshire (425)" but I want to get Elwynn Forest (34) and I can't.

Has the API changed in some way that means the wowhead zone ids are no longer correct?

All help appreciated.