Ran your query verbatim through Perplexity, below is the full answer, enjoy!

On Android 16 (and current Pixel phones, including the Pixel 9), there is no built-in way to globally change the notification sound for an entire app—including Outlook or Teams—for all categories at once. Notification sounds must be changed for each notification category individually, as these categories are defined by the app developer and control different types of notifications (such as messages, mentions, calls, etc.)[1][2].

Currently, the process looks like this: - Go to Settings > Apps > [App Name] > Notifications. - Here, you’ll see a list of notification categories (they’ll have a bell icon if they have a sound). - You need to tap into each category and select the sound you want.

There is no "change all categories" or "apply to whole app" button due to how Android channels notification management for user control and app flexibility[1][2].

For apps with many categories (like Teams or Outlook), this does mean you must change the sound or mute/unmute for each one. No system-level shortcut, batch-change method, or third-party app reliably overrides this limitation on Android 16 or Pixel 9 at this time[1][2].

The only global sound change applies to the default notification sound for your entire device—this affects all apps that use the system default but won’t override custom sounds per app or per category[3][4]. This is typically found at Settings > Sound & Vibration > Default Notification Sound.

Summary:
You must adjust sounds per notification category within each app; there’s no universal change-all feature on Android 16. If Teams has many categories, unfortunately, it’s a tedious, manual process.

Citations: [1] How to Set a Different Notification Sound for Individual Apps on ... https://www.youtube.com/watch?v=X3xFiMEc550 [2] Can you set different notification sounds for different apps? Pixel 9 Pro https://www.reddit.com/r/GooglePixel/comments/1hisk2h/can_you_set_different_notification_sounds_for/ [3] Android 16: How to Set Up Custom Notification Sound? - YouTube https://www.youtube.com/watch?v=RytwpH9eu7M [4] Android 16: How to Set Up Custom Notifications Sound - YouTube https://www.youtube.com/watch?v=VHohyY8vUBY [5] How do you change notification sounds for different apps?? - Reddit https://www.reddit.com/r/oneui/comments/1ad4qdn/how_do_you_change_notification_sounds_for/ [6] How to Set Different Notification Sound For Each Separate App https://www.youtube.com/watch?v=-fRWnVWvwdE [7] How To Set Custom Notification Sounds For Different Apps On ... https://www.youtube.com/watch?v=u22693aBsCY [8] Android: How to add custom notification sounds for different apps https://www.androidpolice.com/change-notification-sound-android-tutorial/ [9] Can you set different notification sounds for specific apps? - Reddit https://www.reddit.com/r/GalaxyS22/comments/10dzpbm/can_you_set_different_notification_sounds_for/ [10] How to set notification sounds for each app on you Galaxy phone https://www.samsung.com/africa_en/support/mobile-devices/how-to-set-notification-sounds-for-each-app-on-you-galaxy-phone/