I found this post https://help.yahoo.com/kb/SLN15241.html and tried it. It said " invalid password."

I also deleted my saved password in Thunderbird.

I had used such special passwords for gmail but was not aware i needed such for Yahoo email.

Bob

I disabled the only add-on that Thunderbird was using.

What's the add-on?

I had used such special passwords for gmail but was not aware i needed such for Yahoo email.

You don't need an app password when using OAuth2 authentication.

Thunderbird says authentication failure

Please post a screenshot of the error message. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Also, please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button, then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

I get the image below when I load Thunderbird.

Having trouble getting a screen image of the other error which has text as per the heading of my post.

The disabled add-on is Lookout (fix version) (disabled).

I will post the other error when I can get it with my image capture tool. Bob

See error message attached.

So what we have here is a request for you to authenticate from Yahoo.

This is followed by this failure because you did not authenticate as requested.

The solution is to log into yahoo as requested, using the page displayed for the purpose and wait until the authentication flow completes, there will be more than one page of information about the permissions Thunderbird is requesting that you need to approve once you log in.

yes I do that. I log in using the popped up window. enter my password as requested, click next and say yes to the authentication. That is when I get the error message.

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button, then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

Application Basics

   Name: Thunderbird
   Version: 115.5.0
   Build ID: 20231120220011
   Distribution ID:

   Update Channel: release
   User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:115.0) Gecko/20100101 Thunderbird/115.5.0
   OS: Windows_NT 10.0 22621
   OS Theme:

   Launcher Process: Enabled
   Multiprocess Windows: 0/0
   Fission Windows: 0/0
             Enabled by default
   Remote Processes: 2
   Enterprise Policies: Inactive
   Google Location Service Key: Missing
   Google Safebrowsing Key: Missing
   Mozilla Location Service Key: Missing
   Safe Mode: false
   Memory Size (RAM): 15.7 GB
   Disk Space Available: 205 GB

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.mail.yahoo.com:993, 3, 10
     OUTGOING: , smtp.mail.yahoo.com:465, 3, 10, true

   account2:
     INCOMING: account2, , (none) Local Folders, 0, 3

   account3:
     INCOMING: account3, , (imap) imap.gmail.com:993, 3, 10
     OUTGOING: , smtp.gmail.com:465, 3, 10, true

 Libraries

     Library
     Status
     Expected minimum version
     Version in use
     Path

     RNP (OpenPGP)
     OK
     0.17.0
     0.17.0+PR2073.MZLA.115.5.0
     C:\Program Files\Mozilla Thunderbird\rnp.dll

 Calendar Settings

     Bob Alston

       Name
       Value

       Name:
       Type: caldav
       Disabled: false
       Username:
       URI:
       Refresh Interval: 30
       Read-only: false
       Suppress Alarms: false
       Cache Enabled: true
       iMIP Identity: id1
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported:
       Event Supported: true
       Task Supported: false
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported: true

     Google calendar

       Name
       Value

       Name:
       Type: storage
       Disabled:
       Username:
       URI:
       Refresh Interval:
       Read-only:
       Suppress Alarms:
       Cache Enabled:
       iMIP Identity: id2
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported: true
       Event Supported:
       Task Supported:
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported:

     Home

       Name
       Value

       Name:
       Type: storage
       Disabled: true
       Username:
       URI:
       Refresh Interval:
       Read-only:
       Suppress Alarms:
       Cache Enabled:
       iMIP Identity: id1
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported: true
       Event Supported:
       Task Supported:
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported:

     Holidays in United States

       Name
       Value

       Name:
       Type: caldav
       Disabled:
       Username:
       URI:
       Refresh Interval:
       Read-only: false
       Suppress Alarms:
       Cache Enabled: false
       iMIP Identity: id1
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported:
       Event Supported: true
       Task Supported: false
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported: true

     bobalston@gmail.com

       Name
       Value

       Name:
       Type: caldav
       Disabled:
       Username:
       URI:
       Refresh Interval:
       Read-only: false
       Suppress Alarms:
       Cache Enabled: false
       iMIP Identity: id1
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported:
       Event Supported: true
       Task Supported: false
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported: true

     Birthdays

       Name
       Value

       Name:
       Type: caldav
       Disabled:
       Username:
       URI:
       Refresh Interval:
       Read-only: false
       Suppress Alarms:
       Cache Enabled: false
       iMIP Identity: id1
       iMIP Disabled:
       iMIP Account:
       Organizer Id:
       Force Email Scheduling:
       Popup Alarms Supported:
       Alarms on Invitation Supported:
       Max Alarms Per Event:
       Attachment Supported:
       Max Categories:
       Privacy State Supported:
       Priority Supported:
       Event Supported: true
       Task Supported: false
       Local Time Supported:
       UTC/GMT Supported:
       Auto-Scheduling Supported: true

 Crash Reports for the Last 3 Days

 Remote Processes

   Type: Count

     Isolated Web Content: 1
     GPU: 1

 Add-ons

     Name
     Type
     Version
     Enabled
     ID

       Amazon.com
       extension
       1.1
       true
       amazondotcom@search.mozilla.org

       Bing
       extension
       1.0
       true
       bing@search.mozilla.org

       DuckDuckGo
       extension
       1.0
       true
       ddg@search.mozilla.org

       Google
       extension
       1.0
       true
       google@search.mozilla.org

       Wikipedia (en)
       extension
       1.0
       true
       wikipedia@search.mozilla.org

       LookOut (fix version)
       extension
       6.2
       false
       lookout@s3_fix_version

 Security Software

   Type: Name

     Antivirus: McAfee;Sentinel Agent
     Antispyware:
     Firewall:

 Graphics

re : INCOMING: account1, , (imap) imap.mail.yahoo.com:993, 3, 10

Not sure what the 3 and 10 mean. They represent the Connection Security and Authentication info.

In Account Settings Select the yahoo account 'Server Settings'

• Connection Security = SSL/TLS
• Authentication Method = Oauth2
• User name = full email address

Then check the outgoing SMTP for same account and they should be identical to the above.

• Connection Security = SSL/TLS
• Authentication Method = Oauth2
• User name = full email address

Let me know what you had for those settings.

• In Settings > Privacy & Security

Web Content

• Select : 'accept cookies from sites'

In Passwords section

• Click on 'Saved Passwords'
• Click on 'Show Passwords'
• Make sure all passwords to do with the yahoo account have been removed.

eg: anything that starts with imap://yahoo account... smtp://yahoo account...oauth://yahoo account

Restart Thunderbird.

You should get that prompt again, make sure you enter correct password - same one you use to access webmail and then follow instructions to allow thunderbird access to server.

Security Software Type: Name Antivirus: McAfee;Sentinel Agent Antispyware: Firewall:

Try it with Windows running in safe mode to bypass McAfee and Sentinel Agent.

Had trouble entering safe mode with internet access. Selected "Safe mode with networking" and entered safe mode but no internet. Hum?? Settings for my yahoo account are attached. Also screen image for my web content- cookies shown and also the passwords saved. 'Note I deleted the account for yahoo mail as well as the password. Perhaps that is the issue. Can I re-enter the password entry for Yahoo em'ail??

Thanks for all your help! Bob

If you're connecting by wifi, you have to enable the wireless network adapter manually in Device Manager, when Windows is in safe mode. This isn't necessary when the connection is through the Ethernet adapter.

If the passwords or oauth tokens are removed, you'll be prompted for the account password in the OAuth window when TB restarts.

SOLVED by setting a unique one time application specific password specifically for Thunderbird, done with mail.yahoo.com. Then updated the password in Thunderbird's two stored passwords with this new password and changed the Type of Authentication from Oauth2 to Normal Authentication.