If you're using Google Chrome and you're not receiving your YouTube notifications, there are a few things you can check to see what's going on.
First, make sure that you're signed in to both YouTube and Google Chrome with the same account. If you're not, you won't be able to get notifications.
Next, check your notification settings in YouTube. Go to your YouTube settings and make sure that you've enabled notifications for the channel or channels you want to receive notifications from.
If you've checked both of those things and you're still not getting notifications, try disabling any ad blockers or other extensions you have running in Google Chrome. Sometimes these can interfere with YouTube's notification system.
If you're still having trouble, the best thing to do is contact YouTube support. They can help you troubleshoot the issue and figure out what's going on.