From my understanding, it sounds like the issue is alarms not playing the assigned tone it was given.
Did you give it appropriate permissions (ie. storage)? Did this issue happen after Android 10upgrade?
If this happened after Android 10 upgrade, suggest doing a cache partition wipe first. If that didn't resolve the issue, backup (important) and do a factory reset. WARNING this will wipe everything off device and start fresh.
Wipe cache partition Samsung Galaxy S10+
Turn off the device.
Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
Press the Volume down key several times to highlight ‘wipe cache partition’.
Press Power button to select.
Press the Volume down key until ‘yes’ is highlighted and press the Power button.
When the wipe cache partition is complete, “Reboot system now” is highlighted.
Press the Power key to restart the device.
Thanks for the replies everyone. I have wiped the cached partition this afternoon thank you Cassidy, i have also moved around the audio files to see if that resolves the issue thanks Tallman.
This morning it did it again so hopefully these things will fix this issue... the alarm went off using my ringtone music rather than the beep-beep notification sound it is set to. Now if i snooze it then the beep-beep works when it comes back on. I think theres an issue with the phone waking up initally when the alarm is to go off.
Ill see tomorrow morning if these things fix it.. Jumping out of a dead sleep to ACDC hard as a rock at max volume is getting old ... lol..