Microsoft offers Centralized Deployment so admins can install Excel Add add-ins for many users at once. This is perfect if your company blocks the Office Store globally but needs to allow specific apps (like ExtendInsights) for certain users or groups.
Before you start
You’ll need Global Admin or Exchange Admin permissions in Microsoft 365.
Users must be on Exchange Online or a supported Exchange connection (POP/IMAP won’t load add-ins).
Add-ins can take up to 24 hours to appear for all users (often much sooner).
Deploy the ExtendInsights Add-in
Step 1: In the admin center of your Microsoft Office 365 account, go to Settings > Integrated apps > Deployed apps > Get Apps.
Step 2: This will open the App Source page. Search for the ExtendSync app. Hit Next.
Step 3: Choose who gets the add-in:
Everyone – deploy to the entire org, or
Specific users/groups – deploy to selected users or Azure AD groups, or
Just me – good for testing before a wider rollout.
Use the Search box to add users or groups.
Step 5: Click Deploy. You’ll see a green check when deployment completes. Follow the on-screen prompt to test the add-in.
Step 6: When finished, select Next. If you’ve deployed to just yourself, you can select Change who has access to the add-in to deploy to more users.
💡 Heads-up: Users might need to relaunch Excel to view the add-in icon on the app ribbon. Excel add-ins can take up to 24 hours to appear on app ribbons.
Reference
If you need more detail, see Microsoft’s docs on Centralized Deployment of Office add-ins in the Microsoft 365 admin center refer to this link.
Tips for Orgs that Block the Office Store
Centralized Deployment lets you keep the Office Store blocked while explicitly allowing approved apps like ExtendInsights.
If some users still can’t see the add-in after deployment:
Confirm they’re in the assigned group or user list.
Make sure their mailbox is Exchange Online and their Excel profile is connected as Exchange/Office 365 (not POP/IMAP).
Have them sign out and back in, then relaunch Excel.
Check visibility in Excel on the web first.