The following list might solve the Certificate issues:
Make sure the Root Certificate is installed properly! Follow the steps outlined on our resources webpage.
If your ESP-01 is connected to your local WiFi, it should automatically acquire a proper SSL certificate. Another alternative is to find the IP address of the ESP-01 on your network and use the IP address instead of the hostname.
To tell if the CA is properly installed , browse to https://yourelegoo.local/ If you don't get a security warning, the CA is properly installed. Otherwise try to re-install the certificate.