This looks promising... https://www.ubackup.com/articles/yahoo-mail-not-working-with-outlook365.html#:~:text=Why%20is%20Yahoo%20mail%20not,an%20app%20password%20for%20Outlook.
Haven't had a chance to try it yet... won't have time for that for a few hours.
DonSeay's instructions worked for me. I'm using Windows 10 PC running Microsoft Office 2019 Outlook. I did not have to delete any cox email accounts in Outlook to make the changeover.
I had to setup my Yahoo account first using the link provided in Cox's email indicating it was time to changeover. I successfully did this, and all emails and file folders transferred to Yahoo and can be read in Yahoo's email web browser.
Then I opened Outlook on my PC. I used the Outlook "repair" function, "advanced" settings on my xxxx@cox.net email account to get it to work. I also didn't need to setup two factor authentication in Yahoo to generate an Outlook specific password link on Yahoo.
When Outlook successfully establishes its new connection to Yahoo servers, it starts using my old transferred email account and repopulates all previous files with their subfolders and emails. This takes a couple of minutes. It then began downloading all new "inbox" emails. I did a test email to my Cox.net email account to check it worked and it does. Working perfectly and seamlessly now.
Was your Outlook account using pop or imap settings?
Use imap settings for incoming servers when resetting Outlook to work with Yahoo. These are the servers which must be reset in Outlook.
Incoming: imap.mail.yahoo.com
Outgoing: smtp.mail.yahoo.com
I have tried these new settings along with the new Yahoo password, and it doesn't work. I have Outlook from Microsoft Office Professional Plus 2021. I have also tried the "Repair" function in Outlook and also no luck.
Were you able to use Yahoo's Web Browser email client to see your email after you changed over? If so, that means your changeover was successful.
We would then have to know at what point in the Outlook setup process it failed on you and what it said on your screen when it failed.
