By default, the person who signs up for and buys a Microsoft 365 for business subscription gets admin permissions. That person can assign admin permissions to other people to help them manage Microsoft 365 for their organization.If you get the message "You don't have permission to access this page or perform this action," you aren't an admin.
Microsoft 365 or Office 365 subscription comes with a set of admin roles that you can assign to users in your organization using the Microsoft 365 admin center.
If you need to know how to assign user admin roles, please refer to this.
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