Comments
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I exported the "untrusted certificate" from outlook365 and then imported it as per here https://woshub.com/updating-trusted-root-certificates-in-windows-10/#h2_1 Quite why BitDefender staff don't know about this or indeed are not fixing their CA I don't know
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I too have had this problem and actually opened a case. Unfortunately the engineer I was put in contact with didn't understand the problem and came up with a range of incorrect solutions.