Recently I noticed that my Samsung A71 had stopped getting sound notifications for whatsapp and messenger etc. Looked on forums and nothing that was suggested worked. I went through all settings and found that under sounds and then scrolled down to volume, it was turned right down. I had not done this so maybe latest update changed this automatically? I now have my custom ringtones and sounds back. Can't believe how simple the solution was. How this may help others with the same problem.