How do I set up my Global admin ID for my tenant so that I can access my professional email id?

Question

How do I set up my Global admin ID for my tenant so that I can access my professional email id?

Mohit Agarwal 0

I need to get this set up, so that I can send some approval mails from my global id email id. how do I get it set up?

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2 answers

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Answer 1

Heimerdinger 295 Independent Advisor

Hi @Mohit Agarwal,

Based on your description, the Global Administrator account is normally created during the Microsoft 365 Business subscription purchase and tenant setup process. It is not something that usually needs to be created separately afterward.

To better understand your situation, could you clarify a few points?

Do you currently have access to the Microsoft 365 Admin Center?
Are you trying to recover an existing Global Administrator account, or create a new one?
Can you access your professional email with another account?
If you receive an error message, could you provide a screenshot of the exact error?

However, if you already have access to the Microsoft 365 Admin Center for your tenant, you can create another administrator account by following these steps:

Sign in to the Microsoft 365 Admin Center.
Go to Users > Active users.
Select Add a user.
Enter the user's name, display name, and username.
Assign an available license if the account needs access to services such as Exchange Online email.
Under Roles, select Admin center access and assign the Global Administrator role.
Complete the wizard and save the account details.
Sign in with the newly created administrator account and access Outlook.

The answers to these questions will help determine whether this is an account access issue, a licensing issue, or an email mailbox configuration issue.

Mohit Agarwal 0 Reputation points

2026-09-11T12:05:08.4933333+00:00

Hi @Heimerdinger

Thankyou for the update.

I have purchased the Microsoft Business Basics Licenses for now, which has created a mailbox service for me. But all my outgoing mails from this email seem to go in Junk folders of my recipients. I cannot figure it out how do I get it fixed so that it goes in the inbox and not junk folder.

The Business Basics license is running on the 1 month free trial version as of now.

Additionally my main motive was to register for this programme (Screenshot attached), and I need to send an approval mail to Microsoft team form global admin mail id, that's why I created this mailbox. Any thoughts on this?
Heimerdinger 295 Reputation points Independent Advisor

2026-09-11T16:25:27.32+00:00
Hi @Mohit Agarwal,

Thank you for the additional information.

Since you are using a newly created Microsoft 365 Business Basic mailbox, one thing I would recommend checking is whether email authentication has been fully configured for your domain.

If you can sign in with the Global Administrator account, please go to the Exchange Admin Center and verify that DKIM and DMARC are configured for your domain. Missing or incomplete email authentication records can contribute to messages being treated as spam or junk by recipients' mail systems.

Microsoft provides the following guidance:

Configure DMARC: Set up DMARC to validate email in Microsoft 365

Configure DKIM: How to use DKIM for email in your custom domain

Please note that the Global Administrator account is typically the account that was created during the initial Microsoft 365 tenant setup process. In many cases, this is the account that was used to purchase or set up the Microsoft 365 subscription and has full administrative access to the tenant.

Please note that this is a user-to-user support forum, so I do not have access to your tenant or Microsoft's internal registration systems, but I'll do my best to help based on the information you provide.

Thank you for your time and cooperation.

Answer 2

To set up the Global Administrator ID for a Microsoft 365 tenant and use it for professional email, use this process:

Create or identify the admin account for the tenant.
- Each Microsoft 365 tenant has a user ID for each account.
- The first admin account is typically created with the default tenant domain, such as ******@tenant.onmicrosoft.com.
- That account can be the Global Administrator for the tenant.
If the tenant is new, create the Global Admin account during tenant setup.
- During setup, enter the admin username, domain name, and password.
- Record that username and password because this becomes the admin sign-in account.
Add and verify the organization’s custom domain if professional email should use the company domain instead of the default onmicrosoft.com address.
- Microsoft 365 creates the default onmicrosoft.com domain automatically.
- After setup, add the custom domain to the tenant.
- Once the custom domain is verified, the admin account’s username and email address can be changed from the onmicrosoft.com address to the professional domain address.
Use the alternate email address if the admin ID is forgotten.
- During sign-up, Microsoft 365 requires an alternate email address not connected to the tenant.
- Microsoft sends an introductory email there that includes the user ID and the sign-in URL.
- If the Global Admin user ID is forgotten, check that introductory email.
If the goal is to assign or confirm the Global Administrator role for a user:
- In the Microsoft 365 admin center, go to Roles > Role assignments.
- Select Global Administrator.
- On the Assigned tab, select Add users.
- Enter the user’s display name or username, select the user, and choose Add.

Important detail:

The onmicrosoft.com admin account is expected at first and acts as the default routing domain for the tenant.
To send approval emails from a professional address, the custom domain must be added and verified first, then the admin account can use that domain for its username and email address.

References: