A Microsoft file hosting and synchronization service.
Hello Gary S
Hi, I'm Karl and will be happy to help you today.
First, just so there is no misunderstanding, this is a public user-to-user support forum. We're users helping other users. We do not work for Microsoft and have no access to any user account so there is nothing we can do or check from within the forum. We have no input on Microsoft's policies, procedures, or design decisions.
With that said, unfortunately there is no mechanism whereby you can merge accounts. It is simply not possible
The only option would be
#1 -To configure both accounts in the Outlook desktop program and manually move the data from one account to the other or you could export one mailbox and import it into the other using the Outlook Export / Import process.
Export or backup email, contacts, and calendar to an Outlook .pst file https://support.microsoft.com/en-us/office/export-or-backup-email-contacts-and-calendar-to-an-outlook-pst-file-14252b52-3075-4e9b-be4e-ff9ef1068f91
Import email, contacts, and calendar from an Outlook .pst file https://support.microsoft.com/en-us/topic/import-email-contacts-and-calendar-from-an-outlook-pst-file-431a8e9a-f99f-4d5f-ae48-ded54b3440ac
#2 - As far as your OneDrive files go, you can use the mover tool
In short, there is no one-step migration process from one account to another.
If you have any questions, don't hesitate to ask, we're here to help you further if needed.