Hello, David Cupples.
Log in to your personal Microsoft account (the one that is not blocked, for example, the one with which you wrote on this forum) on the page https://support.microsoft.com/en-US/home/contact?SourceApp=smc2&ContactUsExperienceEntryPointAssetId=www.microsoft.com
In the search bar, type (without quotes) "agent support" and press Enter or click on Get Help. Ignore the search results, and click on the "Contact Support" button at the bottom. On the next page, select "Other Products" and "Billing and Account Profle questions" from the drop-down lists, and then click on "Confirm". Next, select the chat "Chat with a support agent in your web browser" and on the next page, enter (if requested) your (the one that works) email address and click on "Confirm". A chat window opens in a new tab. Wait for the MS support specialist to respond and explain the situation to him.
Note. The chat is available during business hours and on business days according to US time.