However as I understand from most common Microsoft schema, Language should be something specified as a
BCP-47 language tags such as "en-US" or "fr-FR".
I saw something interesting from
TileUpdate:
The UriTemplate attribute must be a value URI per RFC 3986. It must be an absolute URI with only
schemes of unsecure "http:" sites and secure "https:" sites permitted.
Simply search on the Internet, looks like RFC 3986 us Alpha-2 country list.
--James
<THE CONTENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED>
Thanks
MSDN Community Support
Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.