AOL mail not working with Windows 10 mail ?

Is your password current? Try logging into aol.com use the password to confirm it is not a password problem. If the password is good, try the following:
Choose Settings > Manage Accounts.

Choose the account that's out-of-date to display the account settings dialog.

Choose Change mailbox sync settings > Advanced mailbox settings. You may have to scroll down in the dialog to see Advanced mailbox settings.

Check the boxes for Require SSL for incoming email and Require SSL for outgoing email and then choose Done > Save.

https://support.office.com/en-us/article/your-a...

Hello tynaskos, I’m Virginia an independent advisor here.
I’ve seen that error on accounts which have two-factor/step authentication where the user requires an app specific password which is entered in place of the account password.
Does the AOL account use this security feature?
If not then check the usual ‘suspects’: username & password, whether the account uses SSL & whether the port numbers are set correctly.
AOL Mail IMAP Settings
The IMAP settings for AOL mail are as follows:

AOL Mail IMAP server address: imap.aol.com
AOL Mail IMAP user name: Your full AOL Mail email address. For AOL email, this is your AOL screen name plus "@aol.com," such as "*** Email address is removed for privacy ***" (or @love.com, @games.com
AOL Mail IMAP password: Your AOL Mail password
AOL Mail IMAP port: 993
AOL Mail IMAP TLS/SSL required: yes

Enter these SMTP settings to send outgoing email through to your AOL Mail account from any email program.
Incoming Mail Server: imap.aol.com
SMTP Outgoing Server Address: smtp.aol.com. Set the port to 587
SMTP Username: "*** Email address is removed for privacy ***" (or @love.com, @games.com or @verizon.net)
SMTP password. The password you use to log in to AOL Mail

https://www.lifewire.com/what-are-aol-mail-imap...

Information on two-step authentication:
https://help.aol.com/articles/2-step-verificati...

Thank you for the steps, we did all the deleting and reinstalling and found out it is an aol issue.  My phone and IPAD were having the same symptons.

They finally resolved it around 2 pm central time,

Good to hear all is now OK.