This Microsoft 365 blog post will show how to add a custom App tile to the Microsoft 365 App section.
The Microsoft 365 Apps section and App launcher allow users quick access to Apps integrated with 365. Using custom tiles, we can create apps and link to internal and external applications.
Add Custom Tile
To add a custom app tile, Open the Microsoft 365 admin Center.
Click on Settings
Custom tiles for Apps
Click on Add a custom tile.
Add the name and URLs to the custom tile page and complete the process.
Once finished, you can test and see if it works by opening office.com/apps. Scroll down to Admin selected and click on the app.
After clicking on the tile once, the app will be added to the Microsoft 365 App Launcher, as shown below.