more than one microsoft account uses the email:

The sign-in prompt and the separate Microsoft Learn profile are caused by having multiple Microsoft accounts and aliases that share the same email address. These accounts cannot be merged, but the sign-in experience and which account uses a given email can be controlled.

Key points from the behavior described:

• There is at least one personal Microsoft account and at least one work/school (Entra ID) account that use the same email address.
• Microsoft Learn progress is tied to one specific Microsoft account identity; signing in with a different account (even if it uses the same email) creates a separate, empty Learn profile.

To stabilize sign-in and align Learn with the correct account, use these steps:

1. Understand why “Which account do you want to use?” appears
   When the same email address exists as both:
   • a Personal account (Microsoft account / Outlook.com), and
   • a Work or school account (created by an organization in Microsoft Entra ID), the sign-in page must ask which one to use. This is expected when organizations create work accounts that match an existing personal address.
2. Decide which account should own the Learn profile
   • Sign in to Microsoft Learn using the account that previously held the badges/credits (likely the original alias that was used before changing the primary sign-in).
   • Confirm that this account is the one that should continue to own the Learn history.
3. Rename or adjust aliases on the personal Microsoft account
   To reduce confusion and avoid the “Which account” prompt, change how the personal account uses the email address:
   • Go to Manage how you sign in for the Microsoft account and either:
     • Set a different alias as primary, or
     • Add a new alias and make that the primary sign-in.
   Steps:
   1. Open the Manage how you sign in page for the Microsoft account.
   2. Under account aliases, use Add email to add a new alias if needed.
   3. Select Make primary next to the alias that should be the main sign-in.
   4. Optionally, select Remove next to any alias that should no longer be associated with this account (being careful with Outlook/Hotmail/MSN aliases—removal is permanent).
   Notes:
   • Aliases share the same mailbox, contacts, and settings; any alias can be used to sign in unless disabled.
   • The primary alias is what appears on devices and in many sign-in prompts.
4. Avoid removing critical Outlook.com aliases unintentionally
   • If an alias from a Microsoft domain such as @outlook.com, @hotmail.com, @live.com, or @msn.com is removed, it is permanently deleted and cannot be attached to any Microsoft account again.
   • Before removing anything, ensure that the alias is not the one receiving important mail (such as the confidential messages mentioned).
5. If a work/school tenant is using the same email
   • Where a work or school organization has created an account using the same email address (for example, a previous employer’s tenant), that organization controls that work/school identity.
   • To stop conflicts caused by that organization’s account, contact that organization’s IT and request removal of that identity if it is no longer needed.
6. Handling multiple accounts that share the same email
   • Multiple Microsoft accounts cannot be merged. Purchases, data, and Learn history cannot be combined into a single account.
   • The most that can be done is:
     • Close unneeded Microsoft accounts after moving their aliases off them, and
     • Reassign an email address as an alias on the primary account that should remain.
7. Change or manage email/phone on the main Microsoft account
   If additional email addresses or phone numbers are needed for verification or sign-in:
   1. Sign in to the Microsoft account’s Your info page.
   2. Choose Add email, Add phone number, or Remove next to existing entries as appropriate.

After these steps, continue to sign in to Microsoft Learn only with the chosen primary Microsoft account (and its aliases). This will ensure that the same Learn profile with existing badges and credits is used consistently.

References:

• Which account do you want to use?
• Add or remove an email alias in Outlook.com
• Change the email address or phone number for your Microsoft account
• Help with "phone number is already used" in a Microsoft account
• I realize I have 2 different accounts. How do I combine the 2? - Microsoft Q&A
• MSN email issues - Microsoft Q&A