Funny thing, other people have complained about similar issues, specifically about mapping England. They too couldn't find all of the required codes to fill their map. England/UK what ever you call it is so ancient is has a very confusing to non-natives mix of location names and alternative spellings.
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MS has not replied with a complete list.
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Your best bet is to google you butt off to find an existing example map of England with the appropriate location names/codes/abbreviations. If you find any, even in the wrong location subdivisions, please post them back here so we can share them with others in the future.
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Submit a feedback to MS complaining about this deficiency. The map template should ship with complete list of the names required for the various subdivisions.
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You could also try posting your question on Facebook and/or Twitter
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Feedback Hub
The “Answers” forum / community is “staffed” mostly by users like yourself, unpaid volunteers. This forum is intended more for “How to do something in application A” type questions. We sometimes can provide work-arounds for problems, but we can’t do anything about underlying problem. If the forum can’t solve your question you need to talk directly to MS, you need to submit a “Feedback” to MS.
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For a couple of years now MS has had a "feedback" process that allows users submit bug reports / problems, suggestions and new feature requests directly to MS developers and managers. You can submit feedbacks from within many MS apps, or you can use the Win10 “Feedback Hub” app. This article describes the different ways you can submit Feedback to MS:
https://answers.microsoft.com/en-us/msoffice/forum/all/microsoft-feedback-process/6f850368-8c86-481d-a207-d95b265c4be4
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There is also a new web based “Feedback Portal” in development. It is still labelled “Preview”. It provides functionality similar to the feedback hub. Access to feedbacks submitted in 34 categories.
https://feedbackportal.microsoft.com/feedback/
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As users we are unpaid quality control testers, we identify bugs, they pick which feedbacks they will work on, and when they will release them, for testing by Insiders and to general public.
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But don't "expect" anything like feedback about your feedback back from MS.
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MS will make fixes and changes on their own schedule.
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They will not provide much, if any, advance notice of what they are working on and/or when it will be released.
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Hint : get a “share” link to your feedback (may take a couple of minutes to process the initial submission of the feedback) and post the link back to this question. That way if someone finds this question they will be able to link directly to your feedback so they can vote for it and add their comments. The more feedback on a subject, the more likely it is to be acted on.
i.e.
"Feedback" suggesting that they create a "Support / Support" category in the feedback app to collect complaints about poor service in MS Support: https://aka.ms/AAdyeq0
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PS: also be publicly vocal about your complaints. Post on social media
https://cloudblogs.microsoft.com/industry-blog/microsoft-in-business/media-comm/2017/04/18/microsoft-uses-social-media-create-customer-experience/
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Facebook
https://www.facebook.com/pg/Microsoft365/posts/
Follow Microsoft 365 on Social Media: Post Complaints on Twitter
https://docs.microsoft.com/en-us/microsoft-365/community/microsoft-365-on-social-media Go to above page for the following list
General
If you're having general issues with Microsoft 365, be sure to check the Microsoft 365 Service health status page and/or follow @MSFT365Status for information about any known service incidents.
You can reach out to Microsoft Customer Service & Support directly on twitter: @MicrosoftHelps.
Messaging and Communications
Seeking help on Microsoft Teams? Include #MSTeamsHelp in your tweet.
Content Management
Seeking help on SharePoint and Content Management? Include #SPhelp in your tweet.
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