If you are not into CLI(Command Line) functionality of the V3 of the OpenVPN Connect Client to Import Certificate on your connect client. which you can find HERE Then, there is a way to do this on your windows machine via the Import Certificate Wizard for windows.
1. Double click the PKCS 12 certificate you want to import to the client and you will be shown the below window:
2. Click Next and on the next window, double-check and make sure you have the correct path for the PKCS 12 certificate you want to import and click Next.
3. Then, you will have the window for the Private Key protection portion, here you need to make sure to provide the private key you used to generate the PKCS 12 certificate.
4. Then make sure you have selected the checkbox for "Mark this key as exportable".
Note: Not selecting these import options will result in the certificate not being shown or recognized by the client. And it will not be displayed automatically under "Certificate & Tokens" on your OpenVPN Connect Client App.
If The import is successful, your V3 connect client app should be able to pull and recognize the certificate without any issues. And it will be displayed automatically under Certificate & Tokens as shown below.
You can check our guide HERE for the Command-Line Functionality for OpenVPN Connect.
If you have additional questions please submit a ticket