Hi Cyrus,
Normally admin follows the steps below to disable ulti-factor authentication:
- Go to the Office 365 admin center.
- Go to Users > Active users.
- Choose More > Setup Azure multi-factor auth.
- Check your account.
- Click Disable on the right.
For more information, please refer to Set up multi-factor authentication for Office 365 users.
If you get the account from your company, you need to ask your IT admin to change the setting for you.
If you have any further concern, please provide some more information:
- About “I am the only person on the account”, do you mean that you are the only person in your organization or you use this account by yourself?
- About “I get messages that only the "administrator" can do this”, could you please tell us where did you get the error message? Please also provide a screenshot of the error message.
Regards,
Joshua