From: worldoff9908@gmail.com   
      
   David H Durgee wrote:   
   >> It sounds like it is trying to set up Oauth2. Maybe   
    you have to enable   
   >> javascript? Or maybe it is requesting 2FA?   
   >>   
   >   
   > I thought I had Oauth2 already setup on all my mail connections, but   
   > perhaps I missed it.  Looking in my passwords do not show one for that   
   > email address, so that may be the problem.   
      
   I noted elsewhere in this thread that if NoScript is installed, then you   
   definitely need to whitelist all the Yahoo-related domains in use (or as   
   a testing thing, temporarily disable NoScript).   
      
   I believe that OAuth2 *is* a form of MFA.   
      
   Yahoo hasn't been as enthusiastic as Gmail and Microsoft about doing   
   OAuth2, and I think the current status is that they're supporting OAuth2   
   (and probably preferring it). The alternative to OAuth2 is that they   
   continue to support "application passwords", where you go into Yahoo's   
   configs and get a separate password that you save into your mail client,   
   and where that's a different password than what you use to log into   
   Yahoo directly.   
      
   I just made a check of my own Yahoo account, and I see that it's set to   
   use Normal authentication, which would mean that I haven't bothered to   
   convert that account OAuth2 (at least not in Seamonkey -- I also have   
   that in setups on other machines, and I may have enabled OAuth2 there).   
      
   Probably the first step would be to review Yahoo's documentation on   
   configuration of Thunderbird, and that should include instructions both   
   on how to work with OAuth2 as well as a secondary password.   
      
   If you choose to continue with a secondary password, get a new one, and   
   if you're getting a prompt for a password, enter that password.   
      
   On the other hand, I've lived with OAuth2 long enough that I'm used to   
   it. Thus, you could go the route of removing all Yahoo passwords saved   
   in the password manager. Then, when you try to check mail, you'll get   
   the normal password request (enter your normal Yahoo password), and then   
   when Seamonkey tries to connect to Yahoo's server, you should see a   
   pop-up that demands your password. When you re-enter your regular   
   password, then the OAuth2 token gets created, and should be sufficient   
   for ongoing use.   
      
   I will note that this is how it *should* work, and I haven't actually   
   seen Yahoo's dialogs recently enough to know if there's something I'm   
   missing.   
      
   Smith   
      
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