Thanks for reaching out. Are you using the stock alarm clock that came pre-downloaded on the device or a third-party one? I see that you have mentioned that you already cleared data. Have you tried wiping the cache partition on your device? See if that helps.
Follow these steps:
- Turn off the device.
- Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
- When the Android logo displays, release all three keys.
- An ‘Installing system update’ message will show for 30 – 60 seconds before the Android system recovery menu options appear.
- Press the Volume down key several times to highlight wipe cache partition.
- Press Power key to select.
- Press the Volume down key to highlight yes, them and press the Power key to select.
- When the wipe cache partition is complete, Reboot system now is highlighted.
- Press the Power key to restart the device.
Your phone will take a little time booting up after the cache partition is wiped off of its contents as it will rebuild or recreate those caches. Don’t be alarmed if the phone gets stuck on the logo for a minute or two after this just don’t turn it off so that what was deleted will be replaced successfully. So, wait for your phone to become active. Don’t worry, this procedure is very easy and safe to do. You won’t damage your phone just by wiping the cache partition.
I was having the same problem and finally figured it out. This is how I fixed the issue:
Click and hold the clock app
Select app info
Scroll down to the Advanced section
Turn on Appear On Top
I just upgraded from Note 9 to Note 10+ 5G and I'm having the same issue but nothing has worked. When my ringer is off, the alarm won't sound. This hasn't been the case ever in the past with any Note I've had. Is this a change this year?