Unable to Reactivate Skype Credit - Billing Address Cannot Be Saved

There is no documented self-service way to repair or reset the billing profile directly.

The supported path is:

1. Open the Microsoft account profile at https://account.live.com.
2. Go to Your info.
3. Verify that language is set and not blank.
4. Verify that country/region is correct.
5. Save any corrections.
6. Try adding or updating the billing address again.
7. If it still fails, try the same update in an incognito/InPrivate browser session.
8. After the billing address is accepted, reactivate Skype Credit from My Account by selecting Reactivate Credit.

A moderator-recommended resolution for the same billing-address failure was that the Microsoft account profile did not have a valid language/region locale set. After correcting the language/region information, the billing address could be saved.

Additional supported details:

• Skype Credit becomes inactive after 180 days of no use.
• Reactivation can take up to 15 minutes.
• An email is sent when reactivation is complete.
• If using iPhone or iPad and Reactivate Credit is not available, clear browser history and cookies, then sign in again.
• If the account shows Account blocked or paid services are unavailable, use the account-help flow for locked or compromised Skype accounts.

References:

• How do I reactivate Skype Credit? | Microsoft Support
• How to manually update my billing information or reactivate my Skype Credit? - Microsoft Q&A
• can not update billing address - Microsoft Q&A
• Can't update my billing address - Microsoft Q&A
• activate skype credit - Microsoft Q&A
• Troubleshooting Skype subscriptions | Microsoft Support
• I need help with my Skype account | Microsoft Support