I can't access the page for the products I previously purchased. !!!

Hello Eimskip Viet Nam, thank you for posting in the Microsoft Q&A community.

Volume licenses for products like Windows and Office purchased around 2017 were managed in the Volume Licensing Service Center (VLSC). Recently, Microsoft migrated these management experiences to the Microsoft 365 admin center. This transition requires you to log in with a managed "Work or School" account (Microsoft Entra ID) rather than a personal Microsoft account. If the email account you used previously was never converted to a managed tenant, or if the Administrator for your company's environment is unknown or inaccessible, you will be blocked from logging in.

Your primary option is to perform an internal admin takeover if your email domain is tied to an unmanaged tenant. You can often trigger this by signing up for a free Power BI or Microsoft 365 trial using your exact work email address. Once you access the user portal, navigate to the Admin icon. The system will prompt you to "Become the admin" and ask you to verify domain ownership by adding a specific TXT record to your domain's DNS settings. Once the DNS record is verified, you will be granted the Global Administrator role, allowing you to view your organization's billing, products, and volume licenses.

If the internal takeover is not possible, or if the system states the tenant is already managed by someone else, you will need to bypass the portal and contact our support teams directly by phone. Since you mentioned you do not have the support number, you can find the dedicated customer service phone number for your specific country on the official Microsoft Learn page provided in the references below. When you call, tell the automated system you need "Account recovery for Business Administrator." Choose the prompts for Business/Office 365, confirm that you are an Administrator, and specify that there is no other administrator available. This will allow the agent to route your case directly to the Data Protection Team, who are the only engineers authorized to verify your business identity and manually restore your admin access.

I will follow up on this thread to ensure that you regain access to your licenses. If this helps, please consider "Accepting" the answer.

Official Microsoft documentation for your reference:

• Sign in to the Microsoft 365 admin center for volume licensing
• Take over an unmanaged directory as administrator in Microsoft Entra ID
• Get support for Microsoft 365 for business - Phone Support

I don't have a Microsoft support phone number or email address. I also can't create a support service ticket on the 365 admin page because I don't have an account to log in.

Access to the product management page for older Windows and Office licenses now depends on signing in with the correct work or school account and tenant in the modern admin experiences.

Because sign-in is failing and the account is tied to business licenses, this requires direct Microsoft support intervention rather than self-service recovery.

Follow these steps:

1. Contact Microsoft support by phone
   • Use the Microsoft customer service phone numbers listed at Customer service phone numbers - Microsoft Support (see references below).
   • When the automated system asks about the problem, clearly state that access to a business/volume-licensed Windows/Office account is locked and that the admin account cannot sign in.
   • When prompted by the IVR, choose options indicating:
     • Business/Office 365 for business
     • Company account
     • You are an administrator
     • There is no other administrator
   • Ask the agent to open a service request and route it to the appropriate team (Data Protection / account recovery) for an admin sign-in issue.
   • Provide:
     • The email address that was used to register the licenses
     • Any agreement or license details available
     • Error messages seen when trying to sign in.
2. If support access is blocked because sign-in is required
   • Create a temporary Microsoft 365 trial tenant (as described in the referenced Q&A answers) only to gain access to the Microsoft 365 admin center.
   • From the new tenant’s Microsoft 365 Admin Center, go to Support → Help & support and open a ticket.
   • In the ticket, explain that access is needed to a different, existing tenant where the admin account (the email used in 2017) is locked, and request help from the Data Protection team to restore admin access.
   • After the original tenant issue is resolved, cancel the trial subscription to avoid charges.

For any volume-licensing–related profile issues (if these licenses were under a volume agreement), Microsoft Volume Licensing Support may also be involved, but the first step is to regain access to the admin account via the support channels above.

References:

• Sign in to the Microsoft 365 admin center for volume licensing
• I can't sign in to my Microsoft account
• Services Hub sign in FAQs
• I cant log in to my business account because it is requiring Authenticator app which I do not have - Microsoft Q&A
• I have a Micrsoft business account and I am the admin and the only user registered under this account. I can't log in because i have replaced my phone and the authenticator doesn't work. - Microsoft Q&A
• Microsoft authenticator sending me into a spiral - Microsoft Q&A
• Requesting a Tenant Admin MFA Reset - Microsoft Q&A