Are you trying to use the tones already in the phone or download ones @Suzij
Are your volumes turned up.
This can usually be checked by pressing on the phones volume rocker switch and when the volume bar appears press on the v which will open your other volume bars.
Settings - Sounds and Vibration - Sound Mode - Choose Sound.
Settings - Sounds and Vibration - Notification Sounds - Check they all show your chosen tones.
If so and everything is turned On and set then soft reboot the device by turning it Off and On.
Current Phone ~Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+ Samsung One Ui 3.1/ Android 11.