Forum Discussion
Simon_Waters_13
Apr 06, 2017Cirrostratus
The March 2020 reference sounds like a CA certificate.
You aren't just picking the first certificate in the list, as most browsers show this as the chain of trust
CA -> Intermediate -> Client Certificate
And they all have to be in date, and otherwise valid. So you have to check expiry date on the last one (you can usually trust the CAs to keep theirs valid).