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BUG Thunderbird->Send Message Error: ...certificate is not trusted beause it is self-signed...->Add Security Exception: Confirm Security Exception: FAILS

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Hello, I recently accepted the automated version upgrade to Thunderbird 91.2.0. I have used Thunderbird for a very long time. With one of my email accounts I attempted to send email today. Thunderbird gave me the error message "Send Message Error: Sending of the message failed. The certificate is not trusted because it is self-signed....[Ok]". Selecting [Ok] segues to "Add Security Exception" with the checkbox selected for "Permanently store...". Please see the attached ThunderbirdAddSecurityExceptionFails.png. For years this used to work. It worked before the new version.

Oddly, I can receive email from the same server with no problem. Therefore I believe this a bug in the new version of Thunderbird.

Thank you.

Attached screenshots

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