It's so great to see you again!! Welcome back! I hope you are doing well. :)
I'm sorry to hear that your notifications aren't working. Have they worked at all for you? If you click on the zero, do you see anything in the box (or do you even see a box)? Just wondering if maybe the notifications are loading for you, but the counter is broken.
Which browser/version are you using? Notifications don't play well in most versions of Internet Explorer or perhaps I should say IE doesn't play well. They do typically work well in Chrome and Firefox.
Let me know and we'll see what we can do to help get them working for you.