Solved Why won't Yahoo accept my email credentials when I try to enter them in Thunderbird?

I bought a new laptop a couple of weeks ago and am still struggling to get my Yahoo email working with the current version of Thunderbird. Thunderbird keeps the password in its Password Manager and when you set up an email account, it wants to know the password for that account. In the case of a Yahoo account, it has you sign in to Yahoo, using the yahoo email address, then you press Next so that it can prompt you for the password. (It already gathered the email address during the setup of the account.)

Whenever I get to the screen that gets you to confirm that email address (which is correct) and then press Next, I get an error message: "Please enable cookies in your browser and sign in again." It gives no clue as to *which* browser it is planning to use. (I have Brave and Chrome, with Brave as my default browser. I also have Edge on the machine but never use it.)

I made a seemingly reasonable assumption and assumed it wanted my default browser, Brave, so I turned on third-party cookies for all of the following domains: yahoo.com, ca.yahoo.com, and yahoo.ca since the email address is in the yahoo.ca domain. It still won't accept my credentials. I then enabled third party cookies for the same domains on both Chrome and Edge but I'm STILL getting the same error message.

I can't think of anything else to try.

I don't have this trouble on my old Windows 10 laptop so I'm wondering if Windows 11 has a known problem that would account for this exasperating behaviour?

You must have cookies enabled in TB Preferences/Privacy, not your web browser.

Thank you VERY MUCH for figuring that out!

That error message was a complete misdirection then. It should have told me to enable cookies in *Thunderbird*, not the browser!