Tried this- didn't work. A useless window "inviting" me to establish a new account but I can no longer use Thunderbird. There doesn't seem to be a way for me to access my accounts any way besides Yahoo's interface.
Getting Cox to Thunderbird was indeed the hardest part. I had set up an App password but never had to use it..I changed SMTP aand IMAP settings in the TB Server settings to the Yahoo ones I am sure you have but the authoriztion OAuth2 does not show up in the drop down until you restart TB a couple of times. Yahoo is very slow so you have to let the servers have time to talk to one another. I have 4 email accounts that after a total of like 12 hours finally have all in TB and working (except of the Unified folder deleting does not delete off inbox until you empty trash).
I hope maybe this helps but check out my other questions and you might stumble upon something that helps.. getting into iPhone was a piece of cake compared to this.
Okay... retrying.
The OAuth2 no-show was one thing that befuddled me. What should I expect (errors) in the interim? Had to reset my Cox account as it was (did so successfully) but am back at square one with the TB transfer.
Bear in mind, all my accounts have been activated on Yahoo. The trick is to get TB and Yahoo to play nice. Yahoo wants to pop a window every time I launch TB disabling checking for messages erases that annoyance.
Thank you for the response.
Edit: now launching TB in turn pops the Yahoo window seeking credentials for webmail without TB seeking a password. Also- "authentication failure" No place in TB to enter new password The Yahoo popup when it attempts to "check for messages" is particularly goading. Grrr....
