Unable to log in at server, Probably wrong configuration, username or password

I have been using Tbird & Yahoo successfully for years. The Yahoo made the change to require OAuth2. After that change I did get new mail. After that I couldn't receive new messages. I decide this could be fixed by removing my Yahoo account from Tbird and setting it up again. # 1 starting from Account Setup, I enter my name, email address and password. # 2 Before clicking Continue I disable blocking on my pi-hole in case that could be an issue. # 3 A pop-up with a Yahoo ad appears. # 4 I click next and enter my password and click next again. # 5 I check a box to agree to some terms and Agree # 6 Tbird gives me a green box saying, "Configuration found in Mozilla ISP database. # 7 I ensure IMAP is selected and click Done. # 8 I get another pop-up from Yahoo # 9 I check a box to agree to some terms and Agree # 10 That green box turns yellow and now says, "Unable to log in at server, Probably wrong configuration, username or password." # 11 I can login to the Yahoo webmail page, and there I see a new message that start with, "Your Yahoo account XXXX was used to sign in to a new third part application on thunderbird." # 12 Accept cookies from sites is checked # 13 I am not using a VPN and my network is the same as when Yahoo and Tbird were playing nicely. # 14 Outgoing Server settings for Yahoo Mail list OAuth2 for Authentication method. What else can I check to setup Yahoo with Tbird? Let me know if there are logs I can provide to help.