SSL CERTIFICATE to HA

Hi all, i have bought a domaine to gandi.net with SSL certificate.
I have installed certificate in my NAS QNAP with sucess but impossible to H.A

Anybody have a solution from that ? i have try all solution download certificat from QNAP and convert to .PEM but whitout sucess and download certificat to gandi and install on HA but whitout sucess.

I have generate new ceritifcat with openssl with this cmd : ```
openssl req -sha256 -newkey rsa:4096 -nodes -keyout privkey.pem -x509 -days 730 -out certificate.pem


but not wotk :( impossible to connect in my home assistant to SSL error :  NET::ERR_CERT_AUTHORITY_INVALID

thank you for help