Hi @Astrid Obradovic,
I understand how confusing and frustrating this situation can be, especially when you’ve just completed the purchase.
May I ask whether the invoice for this subscription was also sent to the email address you no longer have access to, or if you currently have a copy of the invoice? If you do have it, please share the invoice number and the tenant domain name with us via private message, and I’ll check whether there is any helpful information I can provide from our side.
To enter our private message channel, please refresh this thread. A pop‑up will appear at the top; select View messages and share the information there.

If the invoice is not available, please try contacting the Microsoft support team again using this instruction:
1. Find the related hotline number to call the frontline and let them raise a ticket for you (expand region under Business users): Customer service phone numbers - Microsoft Support
2. Carefully follow this instruction to by pass the AI agent:
Depending on your country or region. For some countries, when calling the support number, although there are about 30 seconds opening as something "you can visit the link...." But you can ignore this opening and wait until the option, then "1" as a business email user, "1" again for technical help.
For some countries, it will be an automated conversation like:
- First, when you call the hotline, it asks what kind of problem you are worried about.
- Answered: sign-in.
- A: What kind of product are you using?
- B: Microsoft 365 for business.
- A confirmation: education or company account?
- B: For companies
- A: Are you an administrator?
- B: Yes.
- A: Do you have the other admin in your organization?
- B: No.
- A: You need one.... Service request?
- B: Yes
If calling the support line in your region is difficult, you may use another regional support number that offers service in your language, or contact the English support line if you’re comfortable communicating in English.
If you continue to have difficulties reaching frontline support, another option is to set up a new Microsoft 365 trial tenant and submit a support request from the admin center, describing the issue with your original subscription in detail. This can sometimes help route the case to the appropriate support team.

- Follow the guided setup: Complete the steps to create a new Microsoft account and a new tenant. This will be a separate and independent Microsoft 365 environment.
- Access the Microsoft 365 Admin Center: Once the new tenant is created, navigate to https://admin.microsoft.com/.
- Go to Support:
- Click on "Help & Support" button like this image.
- Toggle Support Assistant option to OFF > Type your issue under "How can we help?" Box > click Get Help.
- The Contact Support button will become available, you can click on it now.
- Choose contact method: "Phone" or "Email"
- Raise a support ticket: Describe your issue in detail. Crucially, you must clearly state that you are locked out of a different, pre-existing Microsoft 365 tenant where you are the administrator. Provide the following information about your locked account:
- The domain name of your locked tenant
- Any error messages you are receiving.
- Details about the issues you are experiencing.
- Your proof of ownership.

- Finally, clicking on "Contact me".
Important notes:
- This new trial tenant will not give you access to any of the data or settings in your original locked tenant. It is solely a temporary means to contact Microsoft support.
- Be prepared for Microsoft support to ask for verification of your identity and administrative rights for the locked tenant.
- The resolution time might be longer as you are contacting support from a different tenant.
- Remember to cancel the trial subscription for the new tenant once your issue with the original account is resolved to avoid any unintended charges. You can typically do this within the Microsoft 365 Admin Center under "Billing" -> "Your products."
- Follow the guided setup: Complete the steps to create a new Microsoft account and a new tenant. This will be a separate and independent Microsoft 365 environment.
I appreciate your patience, and I hope one of the above options helps move things forward.
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