As of June, Firefox and Chrome will no longer accept certificates if they are self-signed or come from a self-signed root CA or the CA of the certificate no longer has a valid root CA. In addition, Google Symantec as root CA owner has withdrawn trust and Google Products then distrust everything where a valid CA refers to Symantec as the Root CA.
This is now also the case with all other common browsers.
Here you should create a Nues server certificate for aaPanel. Under certain conditions, some certificate providers provide free server root certificates for open source software! Just write certain or LetsEncrypt