Cant fetch my certificate: "The server returned an invalid client certificate"

Trying to get my free email certificate. Using chrome to fetch the certificate will result to error message from chrome:
The server returned an invalid client certificate. Error 502 (net:: ERR_NO_PRIVATE_KEY_FOR_CERT)

I wonder if the servers at Comodo are OK.
Tried with firefox also, didn’t get error message, but a popup istead claiming certificate was installed, Yet the certificate was not available in keystore. I tried also revoking certificate and requesting a new one, just in case one can fetch it only once.

Using Linux btw.