To ensure a fully trusted authentication via HTTPS, you can request and import a certificate delivered by a Certification Authority (CA-signed certificate).
When you import the certificate you need to:
import the root certificate
Import the intermediate certificate
Import the CA-signed certificate
Check and import the root certificate on the user workstation
Complete all procedures to successfully import the certificate.
For Edge: go to 'Settings' > 'Privacy, search, and services' > 'Manage certificates'