I have been using this custom domain with domains.live.com hooked up to Hotmail/Outlook.com for many years.  My DNS registration runs through 2021.

Yesterday users in my domain started telling me that they were no longer receiving email.

When I checked in the admin center it said that the status for my domain had been changed to Pending DNS Configuration.  Any attempt to reconfigure it warns me that all of the mailboxes I currently have will be deleted and all user's email will be lost.

Has anyone else seen a similar issue?  How can I restore the domain so my users can receive email again without losing their existing mailboxes?