Requirement: Add a custom Tile to the SharePoint Online app launcher.
How to Customize the SharePoint Online App Launcher?
The app launcher in Office 365 is a grid icon in the top, right corner of the screen that lets you quickly access programs or sites. You can add other applications or sites to the Office 365 App tiles. Here is how:
This takes sometime to reflect. For me, it took 30 minutes. You’ll get a notification once its updated. Also this feature needs Exchange Online mailbox assigned to you and you’ve signed into your mailbox at least once.
The custom tile appears under the app launcher’s All apps. We’ve lost the ability to pin custom tiles to the app launcher, unfortunately!