When you configure your Comodo/Sectigo Code Signing SSL Certificate, it is best to use some specific browsers for that. Here is an article that describes which browsers are best to use for configuring a Comodo/Sectigo Code Signing Certificate.
When you configure your Comodo/Sectigo Code Signing Certificate, make sure that “Advanced Private Key Options” is visible to you in the same way it is shown in the screenshot from the right. Internet Explorer is always a good option to configure your Comodo/Sectigo Code Signing Certificate.
For Mac Users, please see the following 2 resources:
- How to Import and Export a Client Personal Authentication Certificate on Mac OS X Keychain Access
- Codesign Digital Signatures in Mac OS
Attention: The export instructions for Mac may produce a certificate that does not include the Root/Intermediate crt files. Please download the Root/Intermediate crt files and include them in the command for the Code Signing SSL.