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gmail server rejecting password

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Running version 91 on Win10. Suddenly gmail server not recognizing password, so unable to retrieve or send email messages. Typing in the password manually also fails. Also, cannot find a way to view my current passwords. Online Thunderbird Password documentation does not match what I am seeing. I have no Options under Tools, cannot find a Security item anywhere to allow me to view passwords. How do I regain access to my gmail account from this Win10 machine?

91.3 version running on Win7 on another computer is still working just fine for the same gmail account. I cannot find a way to view my password here either, however. Obviously I would like to be able to compare passwords between the two Thunderbird installations. Thoughts?

Running version 91 on Win10. Suddenly gmail server not recognizing password, so unable to retrieve or send email messages. Typing in the password manually also fails. Also, cannot find a way to view my current passwords. Online Thunderbird Password documentation does not match what I am seeing. I have no Options under Tools, cannot find a Security item anywhere to allow me to view passwords. How do I regain access to my gmail account from this Win10 machine? 91.3 version running on Win7 on another computer is still working just fine for the same gmail account. I cannot find a way to view my password here either, however. Obviously I would like to be able to compare passwords between the two Thunderbird installations. Thoughts?

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Saved Passwords are in Preferences/Privacy & Security.

If the authentication method is not already OAuth2 for the incoming and outgoing, change it to that, remove the passwords, restart TB, enter the account password in the OAuth window to allow access. Cookies must be accepted in Privacy & Security for OAuth.