That's odd. Have you checked your spam/junk folder? Also, try clearing your browser's cache and cookies to see if it makes a difference. Here's how: https://goo.gl/u3F9LT
Just to confirm, have you tried following these steps: Go to your YT account notifications > Select “Tips and news for creators (including Creator Pulse email)”? The Creator Monthly newsletters are also available on the YT blog:https://goo.gl/tWaUDV