I don't get the notification when a user requests access to a project

I have a self hosted instance of gitlab-ee running on ubuntu.
I have some projects with visibility set to Internal.
As far as I uderstand logged users can see an internal project without the ability to push to it, but they can request access to the project with the appropriate button.
The issue is that I am the maintainer of one of those projects, but I don’t get any notification that tells me to accept the user.
All the users in my system get emails when gitlab notify them, so the enviroment is working, I have all the notifications set to enable.
What should I check to solve this?