Verizon accounts require app passwords, that are created on the AOL website. Remove the account passwords from Saved Passwords in Preferences/Privacy & Security, restart TB, enter the app password when prompted.

For pop.verizon.net and smtp.verizon.net, use 'normal password' authentication with the app password.

https://help.aol.com/articles/Create-and-manage-app-password

I couldn't find the pages where the prompts are supposed to be.

This helpful person provided a step by step of the AOL website process to create the app password. https://support.mozilla.org/en-US/questions/1361658 Then as christ1 said - you should delete the passwords saved in Thunderbird, and Thunderbird will then prompt you next time you start it. "Remove the account passwords from Saved Passwords in Preferences/Privacy & Security,"