Hi gia219,
To turn on or off Dolby Atoms, see About Spatial Audio with Dolby Atmos in Apple Music:
- "Update your iPhone or iPad to the latest version of iOS or iPadOS.
- Go to Settings.
- Tap Music.
- Under Audio, tap Dolby Atmos.
- Choose Automatic, Always On, or Off."
However, when it comes to your alarms not working, see How to set and change alarms on your iPhone:
"If you have an alarm that doesn't sound or is too quiet, or if your iPhone only vibrates, check the following:
- Set the volume on your iPhone. If your alarm volume is too low or too loud, press the volume button up or down to adjust it. You can also go to Settings > Sounds & Haptics and drag the slider under Ringer and Alerts.
- If your alarm only vibrates, make sure that your alarm sound isn't set to None. Open the Clock app, tap the Alarm tab, then tap Edit. Tap the alarm, then tap Sound and choose a Sound.
- If you connect headphones to your iPhone, the alarm plays at a set volume through the built-in speakers on your iPhone as well as wired and wireless headphones.
Manually adjusting the time on your iPhone in Settings to change app behavior, like game timers, isn't recommended and can affect alarms."
Take care.