How to change the Microsoft account logged in as

Sign out of the current Microsoft account, then sign in at Microsoft 365 with the work or school account to which your business license is assigned.

Switch the browser login

1. Sign out of the currently displayed account.
2. Go to Microsoft 365 sign-in.
3. Enter the business email address supplied by your organization.
4. If asked to choose an account type, select Work or school account, not Personal account.
5. If Microsoft automatically returns to the wrong account, open an InPrivate/Incognito browser window and sign in there. Private browsing prevents the existing account cookies from selecting the other account automatically.[^1^](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID] "Microsoft 365 for business")

Identify the account licensed for the desktop Office apps

If you are unsure which business address owns the license:

1. Open Word, Excel, or PowerPoint.
2. Select File → Account.
3. Under Product Information, note the account to which the product is licensed.[^1^](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID] "Microsoft 365 for business")
4. Sign out of the incorrect account in the application, then use the sign-in option to enter that licensed work or school account.
5. Close and reopen the application and check File → Account again.

You can also check the assigned license by signing in to your organization’s My Account dashboard with the business account, selecting Subscriptions → View, and looking under Licenses. If no Microsoft 365 or Office 365 license appears, contact your organization’s IT administrator.^2^

If the same email address opens both a personal and business account

These are separate identities even when they display the same email address. Always choose Work or school account for the business subscription.

To prevent repeated account-selection prompts, you can conditionally rename the personal account by adding another personal alias, making it primary, and removing the business email address from the personal identity. This retains separate personal and business accounts.^3^

Do not attempt to convert the personal account into the existing business account; personal and business identities cannot be directly converted into one another.^4^

If the business credentials are unavailable

Contact the Microsoft 365 administrator for your organization. The administrator can retrieve the username or reset the work-account password. If the organization has lost access to its only Global Administrator account, contact Microsoft Support and be prepared to verify ownership using items such as purchase records, domain ownership information, or previous payment details.^5^

References

1. [Microsoft 365 for business](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID])
2. Microsoft 365 subscription features aren't available in Office apps
3. Email address linked to family and business account - Microsoft Q&A
4. change personal to business - Microsoft Q&A
5. Microsoft 365 Login Problem - Microsoft Q&A