two accounts

The work account and the personal Microsoft account cannot be merged, but the work account can be stopped from affecting personal use, and the personal account can be used going forward.

Steps to rely only on the personal account:

1. Do not close the personal Microsoft account
   This is the account that should be kept for Microsoft 365, OneDrive, Outlook.com, and other personal services.
2. Stop using the previous employer (work) account for personal services
   • Sign out of Office apps and Microsoft 365 websites where the work account is signed in.
   • Sign back in using the personal Microsoft account only.
3. If both accounts use the same email address and you get a “Which account do you want to use?” prompt
   This means there is both a Work or school account and a Personal account on the same email address. To reduce confusion:
   • Go to the Manage how you sign in section of the personal Microsoft account.
   • Add a new alias (for example, a new Outlook.com address) or use an existing email address, then select Make primary for that alias.
   • After that, sign in to Microsoft services using the new primary alias for the personal account so it is clearly separate from the old work account.
4. If the work account’s domain matches a personal address and causes conflicts
   Where an organization’s domain matches the personal account’s domain, contact the organization’s IT department and ask them to remove or deactivate the work account so it no longer conflicts with the personal account.
5. Use accounts side by side where needed
   If access to old work resources is still temporarily needed, the work and personal accounts can be used side by side (for example, in Outlook or Edge profiles), but data and licenses from the work account cannot be merged into the personal account.

References:

• Which account do you want to use?
• Combining Microsoft accounts
• About accounts in Office