In this case, Microsoft also isn't saying "this is an ISO country code", it's just outputting the letters embedded in the ZWJ sequence as worst case fallback le

In this case, Microsoft also isn't saying "this is an ISO country code", it's just outputting the letters embedded in the ZWJ sequence as worst case fallback letters in an intentionally ugly fallback font block. Those letters come from ISO country codes in working flag emoji, but Microsoft's approach is "dumb passthrough", Microsoft isn't making any political decisions or validating the ISO country codes are actually ISO country codes or anything, it's just outputting "raw data" from the emoji contents itself. Windows also doesn't have an "ISO Country Code Picker" here. They don't provide tools to make flag emoji at all.