This sounds like it might be an upstream bug. Would you mind filing it
at https://bugzilla.mozilla.org/enter_bug.cgi#h=dupes%7CThunderbird, and
sharing the link here?
** Changed in: thunderbird (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1927347
Title:
Cannot reply to PGP-encrypted email despite OpenPGP being configured
for account - thunderbird claims missing signing certificate
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