Hi
Mark Fleming,
Welcome to Microsoft Q&A forum and thanks for using Azure Services.
As I understand, you could not find Azure Database for MYSQL in Azure Portal.
We are sorry about the inconvenience you are facing.
Could you please check if you could see the details of the MySQL DB using Azure CLI command Show the details of a database "az mysql db show"
Also, could you please check if there are any filters applied when searching or looking for MySQL db.
Or probably resources moved between Azure subscriptions or permissions might have changed.
Please check and let us know the result.
If still you could not find the Database, I would recommend you to please file a support ticket for deeper investigation and in case if you don't have a support plan, do let us know here so that we can check on other options to unblock you. Thanks