Microsoft offers a convenient way to install add-ins for multiple users at once. This is also ideal for companies that globally block access to the Office store but need to make exceptions for certain users and/or apps. 

Microsoft has an article here that describes how your Administrator can deploy specific Apps from the store to one or more end users while still preventing access to the store for all users.

Step 1: In the admin center of your Microsoft Office 365 account, go to Settings > Integrated apps > Deployed apps > Get Apps.

Step 3: This will take open the App Source page. Search for the ExtendSync app. Hit Next.

Step 4: On the next page, select Everyone, Specific users/groups, or Just Me to specify to who the add-in is deployed. Use the Search box to find specific users or groups.

Step 5: Select Deploy.

​Step 6: A green tick appears when the add-in is deployed. Follow the on-page instructions to test the add-in.

💡 Note: Users might need to relaunch Office to view the add-in icon on the app ribbon. Outlook add-ins can take up to 24 hours to appear on app ribbons.

Step 7: When finished, select Next. If you’ve deployed to just yourself, you can select Change who has access to add-in to deploy to more users.

👉 Reference: Office documentation link.

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