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unable to send any email, Thunderbird on Windows11

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I'm unable to send any email with Thunderbird on my new Windows11 laptop. I've used Thunderbird for years and years on the old Windows10 one, but it won't send anything with the new one. The version info it gives is "128.5.1esr (64-bit)" Whenever I try to send an email message, it waits a long long time and then gives a popup saying "Login to server smtp.mail.yahoo.com with username bill.marshall@verizon.net failed." It gives me an option to enter a new password, and if I click there it doesn't let me enter the password again, just re-tries, again waits a long long time, then gives the same error popup. When I cancel, it gives a new popup saying to check the password and verify the 'Authentication method' in Account Settings. Authentication method looks fine, but the password (Settings->SavedPasswords) is empty (?? But I entered the password when I started Thunderbird and asked it to save it).

I'm unable to send any email with Thunderbird on my new Windows11 laptop. I've used Thunderbird for years and years on the old Windows10 one, but it won't send anything with the new one. The version info it gives is "128.5.1esr (64-bit)" Whenever I try to send an email message, it waits a long long time and then gives a popup saying "Login to server smtp.mail.yahoo.com with username bill.marshall@verizon.net failed." It gives me an option to enter a new password, and if I click there it doesn't let me enter the password again, just re-tries, again waits a long long time, then gives the same error popup. When I cancel, it gives a new popup saying to check the password and verify the 'Authentication method' in Account Settings. Authentication method looks fine, but the password (Settings->SavedPasswords) is empty (?? But I entered the password when I started Thunderbird and asked it to save it).

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