No longer receiving email notifications

I have my settings in place to receive email notifications each time a student adds an annotation. This was working great, but I have not received any in over a week now, on any document, including ones on which I DID previously receive email notifications. Somehow, a connection seems to have broken down.

Ideas?

U need ideas will let me just say on the bottom right of your chrombook or computer whatever one your using you might have the Do not distrub on because if you do your notifications wont work so look at that but if that doesnt work contact me back. GOOD LUCK!!!