Problem With Unity 3D Publishers Tax Number

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Unity ID Tax Number
To withdraw payments from Unity Store as a publisher, account holders need to be properly registered as being a 'business' entity or and individual. Aside from the usual identity information Unity ID requires a Tax Number be as part of that process. However, for non-United States of America residents (or registered businesses) the 'tax number' provided by local tax authorities may not work - the number can be input but Unity ID will report it as invalid.
The source of the issue seems to caused by a conflict in the way Unity describes what it wants, versus what it actually wants.

In other words Unity ID/Store is asking for a Tax Identification Number, or Unique Tax Reference as they're called in the United Kingdom, that identifies a business (Limited Company, Sole Trader etc.), but is actually expecting a VAT number (Value Added Tax or Sale Tax identifier), a property usually associated with registered business entities. The mismatch causes Unity to throw the 'invalid' error.


Unity Store Business ID
The fix, at least for publishers outside the United States, is to click the link under the Tax Number input field and switch to Business Number. Entering a valid Tax ID, for example a UTR if based in the UK, should then been seen as valid, granting access to fund withdrawals - a Tax ID should be issued by the relevant tax authorities wherever publishers are registered as business/self/employment concern.