The error message NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED is mainly caused by issues related to website SSL certificates. This error occurs when a website’s SSL certificate fails to comply with the Certificate Transparency policy enforced by browsers such as Chrome. It is a security mechanism put in place to ensure that a trustworthy entity has issued the SSL certificate and that it has not been tampered with. There are many different reasons for the error to be occured which are as follows:-
Certificate not added to transparency log
Incorrectly installed SSL certificate
Corrupted SSL certificate
Expired SSL certificate
Even their are different ways to fix the error which you need to understand properly in detail. Hope it helps!