User Name or password for imap.aol.com incorrect
I had the same problem after I reset my AOL password. Afterwards, I couldn't sign on to AOL using my iPhone with the new password. I deleted the account and started over several times, but kept getting the same error message "username or password for imap.aol.com is incorrect." I changed my password again, but nothing worked. I googled it and tried everything. I changed port numbers. I deleted accounts. I deleted and added servers, but I continued to get the same error message. It was frustrating as ****. After devoting a significant portion of two days looking for an answer. Finally, I remembered a code I saved when I set up up AOL 2-step verification. That didn't fix it either, but it lead me to this solution.
Try this:
Sign on to your AOL account
Select "Account security"
Select "Manage app passwords"
Select "iPhone email"
Select "Generate" (a password)
You will be presented with a 16-digit code
Save it, write it down, screen shot it, whatever
Now on your iPhone go to "Settings>Accounts and Passwords>Add Account>Aol."
Enter your AOL information : Name>Email>Password>Description .....BUT.....
Instead of entering your AOL password - use the new 16-digit code you generated
That should fix it.
Good luck.
Mark
iPhone 8, iOS 11.3.1, Setting up Aol. Email