Thanks for reaching out. You should have received an email about the same. Just to confirm, have you checked the email which is associated with the YouTube Channel? Also, could you check your email's spam/junk folder if it's been routed there? Let us know.
I've checked my email id associated with the YouTube channel but there is no email. My monetization page shows that the monetization has been enabled and all of my videos also have green dollar signs now.