Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello RobMacleod,
Thank you for posting question in our forum. From your description I understood that the Office 365 account is shared with 5 users and you’d like to set up two factor authentication for it.
However, for Office 365 Business online environment, all user accounts are managed by organization admin and only admin can set up it for you. I suggest you may contact the person who give you this account and let him reach admin to enable MFA for your account.
As the admin, he’s account can login Office 365 admin center-> Users->Active users-> find and select your account in user list-> choose Manage multifactor authentication.
Or directly login MFA management console to enable and update MFA status for you:
After admin enabled MFA for your account, you can then and have to set up 2-step verification.
Set up multi-factor authentication
Set up 2-step verification for Office 365
Best Regards,
Anna