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The error when adding a billing address is caused by an incomplete Microsoft account profile, specifically a missing language/region (locale). The address service requires a complete profile before it will accept or update any billing address, and if the locale is missing it returns an error like the one shown.
To work around it:
- Open the Microsoft account profile page and edit the profile details.
- Set a valid language/region (locale) for the account and save the changes.
- After the locale is saved, go back to the billing/address page and add the billing address again.
Once the locale is set, the system will treat the profile as valid and allow the billing address to be saved, so Skype credit and calling can be used.
References: