My notifications don't make a sound they don't pop up in a pop up view, they don't vibrate, they don't make a sound, I have restarted everything even a factory reset and nothing helps. I've booted my phone in safe mode and that didn't help. I have the Samsung s20 plus and yes I have all the latest updates
Sorry for your problem.
Go to text messages-settings-notifications and then press and hold "new messages" for about 5 seconds, release it and options will appear. Make sure Alert is active and make sure sound isn't on silent and lock screen says "Show Content."
That should work.
I'm sorry you're experiencing this issue.
In addition to the suggested steps above with making sure your notifications are turned on; make sure "Do Not Disturb" mode is disabled. This mode is very useful when you need to buckle down and focus on matters that you don't want your phone going off. But it disables all notifications/sounds/pop up notifications unless set otherwise.
I hope this information helps!