I tried this with ESR 68. In the account wizard, if we try to sign up with our Fastmail account(TLS 1.3, security.tls.version.min=4), we are only getting the error "Thunderbird failed to find the settings for your email account" but we have https://searchfox.org/comm-central/source/mail/components/accountcreation/content/verifyConfig.js#384 which suggests we should the exceptionDialog.xhtml dialog. What is the correct behavior?
Bug 1590473 Comment 7 Edit History
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I tried this with ESR 68. In the account wizard, if we try to sign up with our Fastmail account(TLS 1.3, security.tls.version.min=4), we are only getting the error "Thunderbird failed to find the settings for your email account" but we have https://searchfox.org/comm-central/source/mail/components/accountcreation/content/verifyConfig.js#384 which suggests we should open the exceptionDialog.xhtml dialog. What is the correct behavior?