A question about migrate account

Heyshotime 

The best option remains Option 1,

However, here are additional solutions for managing the email address change

where you directly add the new email as an alias, set it as the primary address, and retain the old email as an alias.

Email - Shared Mailbox Approach

1. Convert the Existing User Mailbox to a Shared Mailbox

Log in to the Microsoft 365 Admin Center.

Navigate to Users > Active Users.

Select the user mailbox, and under Mailbox Settings, convert it to a Shared Mailbox.

    2.   Grant Access to the Shared Mailbox

Assign Full Access and Send As permissions to User B’s email account.

This allows User B to send emails as the shared mailbox and access its contents.

      3.  Inform the Users

Notify User A that their mailbox has been converted to a shared mailbox.

Inform User B about the permissions and provide instructions on how to access the shared mailbox.

      4.  Verify Permissions

Ensure User B can access and use the shared mailbox in Outlook or Teams.

Test sending and receiving emails from the shared mailbox.

OneDrive - Data Transfer

1. Share User A’s OneDrive with User B

Log in as User A or use admin credentials.

Open OneDrive, select the required files or folders, and share them with User B’s email address.

Ensure Full Control access is granted to User B.

      2.  Remove User A’s License

After the data is securely shared and permissions are set, remove User A’s license in the Microsoft 365 Admin Center.