To use AOL Mail with third-party applications like Outlook, Thunderbird, or Regzion tools, use correct server settings. Activate two-factor authentication in your account, generate an app-specific password to login via AOL Mail.
AOL Mail Setup Guide
1 ) Go to AOL Mail and sign in to your account.

2 ) Hit on your Profile icon/Username and click on Account Info.

3 ) Navigate to Security tab.

4 ) Select Enable 2-Step Verification or press Turn On button.

5 ) Choose the method for 2-Step verification - Phone Number, Authenticator App, or Security Key

6 ) Apply steps for 2FA verification with your chosen method and turn it on.

Note: If you have 2-step verification enabled, proceed to Step 2 to generate an app-specific password.
1 ) After enabling 2-Step verification, visit to AOL Account Security Settings.

2 ) Log in and scroll down to App Password section and Click on Generate app password.

3 ) From the next opened screen, click on Get Started.

4 ) Enter a name (e.g., "Regzion") and click Generate.

5 ) Get the Password and Copy the password shown and use it in place of your regular AOL password in third-party apps (like- Regzion).
1 ) Open Regzion Software and Provide the following details in thier respective fields:
3 ) Test the connection and after success, AOL Mail is ready to use in Regzion Software or other third-party tool.