Please dont merge this into the generic solution that doesnt work - I cannot check my AOL/Verizon email from Gmail anymore
I logged this before and it was merged with the catch all idea to delete your accounts and re add them. THIS DOES NOT WORK. Something has changed on the AOL side to make adding these accounts to Gmail not work. I have a few Verizon/AOL accounts in Gmail that work fine BUT, if I edit them and try to update the password, they fail to connect. If I try to add another Verizon account, it fails to connect. I cannot Add or Update verizon accounts in Gmail anymore. If my passwords ever change, I will be finished because I cannot update them in Gmail due to connection issues. As I stated in my previous post, Google One support worked on this with me at length and determined it is a connection problem on the AOL side. I see others with this same problem as well. Please just help us figure it out instead of telling us to delete and re-add the account. I cant add accounts!

In order to check your AOL Mail from the Gmail platform, you will need to follow the steps from the support article below in order to link your AOL account to Gmail: https://support.google.com/mail/answer/6304825?ctx=gmail&hl=en&authuser=0