try below steps:
Settings, tap Notifications > More. On App notifications, choose All and Show system apps(within three dot), then select Android System > Turn on ‘Show notifications’ option and ‘Allow sound & vibration’
Hi, I am sorry to hear you are having no notification sounds after the update. Just to clarify, have you tried the steps above that iamblue posted? Thank you in advance for your response.
I eventually solved it by installing Google Messages instead of Samsung