Verizon and AOL require an APP password when using email clients on a PC. I believe you must go to the AOL site and select the security page and can set up the APP password there. See this page for more info: https://help.aol.com/articles/Create-and-manage-app-password

According to the documentation you referenced, an APP password is only needed if you have enabled 2 step verification. I have not. My AOL password works on other devices. I think the problem has more to do with the configuration Thunderbird is giving me. Using my desired email address as example@verizon.net , Thunderbird is using the following: Incoming POP3 SSL/TLS

  pop.verizon.net

Outgoing SMPT SSL/TLS

  smpt.verizon.net

Username

  example

I believe when AOL took over the Verizon emails, the POP server became pop.aol.com and the SMPT server became smpt.aol.com Also, I've seen posts that say the username should be example@verizon.net Instead of just example. I've tried all the above combinations and none has worked. Thanks for your help.

Try pop.aol.com and smtp.pop.com (I have verizon account - imap - and it uses imap.aol.com and smtp.aol.com. ) Yes, use full email address.

I did find this url, but it seems a combination: https://help.aol.com/articles/how-do-i-set-up-other-email-applications-to-send-and-receive-my-verizon-net-mail

Tried with the following configuration:

Incoming Server

    Protocol  POP3
    Hostname   pop.aol.com
    Port  995
    Connection Security     SSL/TLS
    Authentication Method   Normal Password
    Username   example@verizon.net

Outgoing Server

    Hostname   smpt.aol.com
    Port   465
    Connection Security    SSL/TLS
    Authentication Method   Normal Password
    Username   example@verizon.net

Error message: Unable to log into server. Probably wrong configuration, username or password. Thanks.

you continully type smpt instead of smtp - is that a simple typo in your text or are you entering that into thunderbird?

Typo. I used smtp.aol.com

THis thread may help, indicating that OAUTH2 may be your solution: https://support.mozilla.org/en-US/questions/1360869

Thanks, David.

Solution was to change the Authentication Method for the Incoming Server to OAUTH2 instead of normal password. TB then went to the AOL site and allowed me to OK TB getting mail from AOL. This was not very intuitive, and I thank you for your help.

You're welcome. I'll make a note of this because I know the issue will surface again.