How to change the global admin of office 365?

Hi Yoke,

Yes, we can achieve this. However, it depends on your scenario. Let me explain it to you:

If we can login to the Office 365 with the original global admin account which you want to remove the right  (Let’s call it Account A), we can follow the steps below to do so:
1.Login to Office 365 with Account A.
2.Go to Office 365 Admin Center> USERS> Active Users.
3.Add an account (Let’s call it Account B) that you want to assign the global admin role to. (Note: If you have already create this account, ignore this step.)
4.Select Account B and click EDIT USER ROLES.
5.In the pop-up window, choose Global administrator and enter an alternative email address.
6.Click Save and then logout Account A.
7.Sign in with the Account B and go to Office 365 Admin Center> USERS> Active user.
8.Select the Account A and click EDIT USER ROLES.
9.Choose User (no admin access) and click Save.
For your reference: Assigning admin roles in Office 365.

If you don’t have the global admin account, please let me know.

Regards,
Fraser