I was issued a new certificate in January, 08th, 2025, and Thunderbird seems to not recognize it as being valid. I´ve double checked all CA´s chain, they are all installed in the computer. When I examine my personnal certificate, the only difference from other certificate that I have installed in the same machine (that is readly accepted and recognized by Thunderbird) is that I see this information in the first level (sorry, in Portuguese-BR): Restrições básicas Autoridade certificadora Não I understand this may be some additional information that is present in the certificate, and that is leading Thunderbird to believe my certificate is not valid, as the certificate itself posts that it´s not a CA. Of course it would not be, it was issued by a chain of CA, that is completely valid. Any thoughts?