Note / announcement about yahoo / thunderbird login
Apparently related to having more than one account logged into from a Thunderbird instance using this authentication method. Need to set up multiple "cookies" for use on appropriate platform.
Using IMAP to access
You may have been asked in Thunderbird to log in your Yahoo, ATT or AOL accounts, or seen a notice with the title Upcoming Account Change. This is the result of Thunderbird, as of version 148.0 on February 22, 2026, switching to a more secure authorization protocol known as OAuth2 with PKCE. Below are instructions to assist you in the log in process.
In addition to enhanced security, this update also allows you to access Yahoo, AOL, and ATT calendars and address books in Thunderbird, which is a major new benefit to users. If you need more information, see OAuth2 Authorization below.
In addition to enhanced security, this update also allows you to access Yahoo, AOL, and ATT calendars and address books in Thunderbird, which is a major new benefit to users. If you need more information, see OAuth2 Authorization below.
You have only one account
If you have only one account, then no change is needed in Thunderbird for PKCE to work. You just log in ("authenticate") by providing your email account and account password (App passwords do not work with OAuth2), and then confirm that Thunderbird may access data on the provider's servers (AOL, ATT, Yahoo, etc). This is a normal and safe process. If you have difficulty, please see Detailed Troubleshooting Steps below.
You have more than one account
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