Is the feature turned On @megatino
I personally prefer to periodically have my phone check if there is an update and manually Download as I prefer to check out an update before letting my phone download it.
I also don't always get a pop up or update waiting icon in the top status bar of my phone either to be honest.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.