Understanding Microsoft 365 admin roles and responsibilities

Most IT admins have run into accounts with more access than they should, whether it’s leftover admin roles or permissions that quietly piled up over time.

M365 uses role-based access control (RBAC) to manage administrative permissions. But those roles aren’t managed in just one place. Core roles live in Microsoft Entra ID, while individual services like Exchange, SharePoint, and Teams introduce their own layers of permissions.

In this guide, we detail the main M365 admin roles and responsibilities while explaining how permissions work and how to keep access under control.

What does a Microsoft 365 administrator do?

M365 administrators manage and secure the organization’s M365 environments. While administrators’ exact responsibilities vary according to their company’s needs, typically they:

• Manage user identities in Microsoft Entra ID: Create, update, enable, or disable accounts and manage groups.
• Assign and manage licenses and service plans: Add or remove licenses and update usage settings as needed.
• Configure workload policies and settings across M365 services: Manage Exchange Online, SharePoint Online, Teams, and OneDrive, while also working across Microsoft Entra ID, Microsoft Purview, and other admin portals for identity, security, and compliance.
• Assign admin roles and delegated access: Provide users with the appropriate level of access without defaulting to broad permissions.
• Support account access and recovery: Configure self-service password reset and step in when users need help regaining access.
• Manage mailboxes and mail flow: Handle mailbox administration and access tasks in Exchange Online.
• Monitor service health and respond to incidents: Track service issues, assess their impact, communicate with stakeholders, and open support requests when needed.
• Support security and compliance configurations: Manage retention, audit logging, eDiscovery, and other controls across Microsoft Purview and security tools.

Admins need to maintain ongoing visibility into who can access what. This is especially important with so many companies adopting AI tools like M365 Copilot. If permissions across your organization are too broad, Copilot can surface sensitive information that you never intended to share widely.

ShareGate Protect is an operational governance layer for Microsoft 365 that gives you unified visibility into access and exposure across SharePoint, Teams, and OneDrive. It helps you identify oversharing, permission drift, and workspace sprawl, and take action through guided, Microsoft-aligned remediation. It doesn’t replace Microsoft’s native tools. It works alongside them—complementing solutions like Purview and admin centers by showing how access actually behaves across your environment and helping you fix issues in context.

Overview of Microsoft 365 admin roles and responsibilities

We’ve put together this handy comparison table to help you understand the difference between various M365 admin roles and responsibilities and their limitations.

Note: Entra ID roles generally apply across identity and directory services, but they can be scoped (e.g., with Administrative Units) and don’t automatically grant access to every workload.

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How admin roles and permissions work in Microsoft 365

You can manage administrative access using M365’s RBAC architecture. RBAC groups permissions into roles and applies them across Microsoft Entra, the M365 admin center, and workload-specific services like SharePoint and Teams. This structure allows you to delegate responsibilities rather than give every admin Global privileges.

Each role provides the admin with a collection of permissions. For example, a SharePoint admin would be granted administrative access to SharePoint sites and settings. The scope of these permissions depends on the role, with some applying broadly across the tenant, some tied to specific services like Exchange or SharePoint, and some only allowing access at the group, mailbox, or workspace level. You can also define whether a role is full-access (has the power to make changes) or is read-only (can view but not make changes).

Why scope and review matter

You should always assign admins the role with the least amount of privileges necessary to complete a task. Only a select few individuals should have global admin access. Higher-level permissions create a much larger margin for unwanted exposure if users misuse an account or malicious actors gain control. 

Carry out regular role reviews to check who has access to what. Automate them where possible so permissions don’t quietly pile up as roles change. These checks can help avoid permission sprawl (when users retain permissions despite changing roles) and role creep (when admins gradually accumulate rights and privileges beyond their day-to-day responsibilities by keeping access rights after they no longer need them).

ShareGate Protect helps you see and understand access across SharePoint, OneDrive, and Teams—so you can spot oversharing, identify exposure risks, and take action to fix them.

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How to assign and manage admin roles in the Microsoft 365 admin center

Here’s a step-by-step guide to assigning and managing admin roles in the M365 admin center:

1. Sign in to the M365 admin center with an account that already has the permission to assign roles.

2. Navigate to Roles → Role assignments. That’s your central hub for viewing and assigning admin roles. Depending on your subscription, you may see tabs like Microsoft Entra ID, Exchange, Intune, or Billing.

3. Select the admin role you want to assign.

4. Review role descriptions and scope carefully. Some roles work across identity and tenant settings, while others are for specific tasks. Be sure to match the level of access to the task, rather than granting broad access unnecessarily.

5. On the Assigned tab, select Add users or Add groups. Search for the correct user and add them to the role.

6. Confirm and document the assignment. Record the user’s name and new role, why they need it, who approved it, and when the next review cycle is.

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In practice, role assignment is centralized in the M365 admin center. But understanding what those roles can actually do often means jumping into other portals, like Microsoft Entra, Defender, or SharePoint, to get a clearer picture of admin roles, permissions, and access across your environment. That makes it easy for overprivileged roles or outdated access to slip through the cracks.

ShareGate Protect consolidates visibility across SharePoint, OneDrive, and Teams in one central platform, so you don’t have to jump between admin centers to understand sharing, permissions, and access patterns.

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Common challenges in managing Microsoft 365 admin roles

While delegating admin responsibilities helps with security and governance, it can be tricky to track each role’s permissions, especially as your business scales. 

Here are a few of the most common challenges:

• Over-permissioned accounts: Users have broader access than they need, leaving unnecessary privilege in place.
• Orphaned or inactive admin accounts: Old or inactive accounts stay behind when people change roles or leave projects.
• Limited visibility into unique SharePoint permissions: When inheritance is broken at the site, library, or item level, it becomes harder to track who has access to what, especially at scale.
• Heavy reliance on PowerShell for comprehensive reporting: While Microsoft 365 offers native views, getting a complete picture of permissions across workloads often requires stitching together data or turning to PowerShell.
• Cross-workload blind spots: Access stretches across Teams, SharePoint, OneDrive, groups, and sharing links.

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Best practices for managing Microsoft 365 permissions securely

Follow these best practices to manage M365 permissions securely and prevent them from expanding in the background over time:

• Limit Global admin access: Keep the number of standing Global admins low (Microsoft recommends fewer than five), and rely on just-in-time access where possible. Don’t forget at least two emergency “break-glass” accounts so you’re never locked out.
• Use workload-specific roles instead of broad access: Assign specific admin responsibilities for Exchange, SharePoint, Teams, Security, and Compliance workloads.
• Conduct regular access reviews: Carry out access reviews regularly rather than waiting for an incident or audit to surface issues.
• Keep an eye on broken inheritance: Unique permissions in SharePoint can spiral fast, especially in large libraries. Regular audits help you spot permission sprawl before it turns into a visibility problem.
• Stay on top of guest access and external sharing: Check who can access information outside your organization and whether permissions settings match up with how teams actually collaborate.

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Microsoft 365 permissions management with ShareGate Protect

Microsoft 365 changes fast. Permissions drift, access expands, and oversharing can go unnoticed.

Even with the right admin roles in place, you still need to review RBAC, watch for permission sprawl and role creep, and regularly review access to keep your work environment secure and compliant.

ShareGate Protect brings that visibility together in one place. It surfaces oversharing, external access, and inactive workspaces across your environment so you can understand what’s happening and take action quickly.

Instead of piecing together signals from multiple admin centers, you get a clear view of access and exposure, plus guided remediation to fix issues as part of your day-to-day operations.

To learn more about how ShareGate Protect helps you understand access, reduce exposure, keep their M365 governance on track, request a demo today.