AOL PROBLEM THAT I CANNOT FIX!!! How to fix the “Cannot verify server identity” notice in iOS Mail App on iPhone Xs

3 OR 4 DAYS AGO I started getting the pictured annoying message on iPhone Xs. It pops up about every 30-60 seconds. I have talked to Apple Care and she tried, but I think this was outside of her element. I have googled everything I could find and still have the problem.

I've deleted the aol email account in question and the message still pops up. I've reinstalled the aol email account in question... and the message continues to pup up.

I'm missing something here... but I just cannot figure it out. I've blocked out my email address in the picture. PLEASE... IS THERE ANYONE WHO CAN TRULY AND "EASILY" HELP????