Note: In Chrome, you need to click on the three dots, select “Save and share”, and click on “Install page as an app”. To set your default PWA site in Microsoft 365, click on the Settings ...
If you’re using a Chromium-based browser like Chrome or Edge ... macOS or Chromebooks. The Outlook PWA seems to be a server-side thing, though – so you’ll see it when you see it as long ...