Created a business user in a business account and its says it doesnt exist

Question

Hi! I created an account which is connected to windows inside an admin business account. When I verify the users activated in that account it says I have 2 including the one just created. But when I try to open it in my computer, it says the account doesn't exist. Also, it says that the account is not activated to Microsoft Business account... I dont know what else to do. Last week I connected the other accound without any problems and this one I cant do.

Answer 1

Dear @Maridan Hernandez,

I understand how confusing this situation can be, especially since you were able to create another account successfully before. To help narrow this down quickly and identify the exact cause, could you please confirm a few details from your side?

• Can you still access to the M365 Admin Center?
• Could you confirm what type of user you created? For example, is it a standard Microsoft 365 user (Member), or was it created as a guest/external user?​‌
• Are you able to sign in successfully with that same account on a web browser, or does it fail there as well?​‌
• On the device where you try to connect the account, are you joining it via “Access work or school” in Windows settings, or are you trying to sign in as a Windows user?​‌
• Finally, when you attempt to sign in, does the error appear immediately after entering the email, or only after entering the password?
• If possible, please provide screenshots to help me diagnose the issue more effectively.   

In the meantime, I recommend you go to the Microsoft 365 Admin Center and open the newly created user > Confirm that the username is correct and that a valid Microsoft 365 Business license is assigned. For reference: Assign or unassign licenses for users in the Microsoft 365 admin center

If everything looks correct, please wait a bit (around 10 to 15 minutes if the account was just created), then try signing in again using a private/incognito browser window.

Moreover, if you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool. For reference, please refer to I can't sign in to my Microsoft account

Note: Please understand that as a forum moderator, my role is to provide general guidance and troubleshooting support. I don’t have access to internal systems or backend tools, and I appreciate your understanding of these limits.

Thank you for your patience and understanding. I'm looking forward for your update.

Answer 2

The behavior matches a sign‑in/activation mismatch between the user account and the Microsoft 365 license or the way the account is being used on the device.

Use these checks and fixes in order:

1. Confirm the correct account type at sign‑in

• On the Windows PC, when signing into Microsoft 365 apps or portal, ensure the user selects Work or School account, not a personal Microsoft account.
• If the user signs in as a personal account, the service can show “That Microsoft account doesn’t exist” even though the work account exists in the tenant.

2. Verify the user has a valid Microsoft 365 business license

• In the Microsoft 365 admin center, go to Users → Active users and open the new user.
• On Licenses and apps, confirm a Microsoft 365 business license that includes Office desktop apps is assigned.
  • If no license is assigned, assign the correct license.
  • If a license is already assigned but activation still fails, uncheck the license, Save changes, then re‑check it and Save changes again to refresh the assignment.
• If the user only has Microsoft 365 Business Basic, there are no Office desktop apps to activate; that user can only use Microsoft 365 Online apps.

3. Make sure the correct Office edition is installed

• Check which Microsoft 365 business product or license is assigned to the user and confirm the installed Office on the PC matches that subscription.
• Also verify the Office bitness (32‑bit or 64‑bit) matches the Windows bitness.
• If the wrong edition/version is installed, run the Microsoft 365 Uninstall troubleshooter to remove Office, restart the device, then install the correct version.

4. Sign out of Office and sign back in with the new business user

• Open a Microsoft 365 app (for example, Word).
• Select the name/profile icon at the top and choose Sign out.
• Close all Office apps.
• Reopen Word, choose Sign in, and enter the new user’s work or school email address and password.
• Try activation again.

5. Reset the activation state if the device previously had another account If the device was already activated with another organizational account, cached tokens can interfere.

• Run the Microsoft 365 sign‑in troubleshooter if available, or follow the documented steps to reset Microsoft 365 activation state for the device, then sign in again with the new user.

6. If the username itself is reported as not existing If any Microsoft sign‑in page reports “account doesn’t exist” for that UPN:

• Confirm the exact spelling and domain in Active users.
• If the sign‑in helper or Microsoft account pages show “account doesn’t exist,” use the Sign‑in Helper tool to check the account and follow the recovery guidance.

If, after these steps, the user still cannot sign in or activate, an admin should:

• Check for sign‑in errors in Microsoft Entra sign‑in logs.
• If necessary, open a support ticket from the Microsoft 365 admin center for deeper tenant‑side investigation.

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References:

• Microsoft 365 Apps activation error: "That Microsoft account doesn't exist. Enter a different account or get a new one."
• Microsoft 365 apps activation error "Another account from your organization is already signed in on this computer"
• I can't sign in to my Microsoft account