Hi Bill Knox,
Thanks for reaching out to Microsoft Q&A.
- Verify that your billing and shipping details are correctly filled out and valid.
- Ensure that the phone number you enter for verification is a valid contact number.
- Consider selecting Other verification options and trying a different method
- Make sure your phone can receive calls or SMS messages from a United States-based telephone number.
If none of them work, reach out to billing support without wasting time.
You can reach out Azure billing and subscription management team by creating a billing support request. Billing support request via Azure portal is free for all Azure customers and doesn't require a paid support plan. Please select 'Billing' under 'issue type' while creating the support request.
https://azure.microsoft.com/en-in/support/create-ticket
Please 'Upvote'(Thumbs-up) and 'Accept' as an answer if the reply was helpful. This will benefit other community members who face the same issue.