This article includes instructions for collecting and exporting your Code Signing certificate using the Edge Browser with Internet Explorer Mode enabled. You must have originally generated your Code Signing certificate in Edge + IE mode to be able to collect and export the certificate this way.
If you purchased your Code Signing certificate after May 14, 2023, you will not need to undergo any of these processes as the certificate will be delivered to you in its final form on physical hardware. This article will be obsolete on June 1, 2023.
Collect the Certificate
After validation is completed, you will receive an email with a link to the collection website for your certificate.
Before you begin the collection process, you must add the collection website URL to the list of Internet Explorer Mode sites in your Edge browser. The Microsoft Edge with IE Mode Generation guide includes instructions for adding URLs to the list of Internet Explorer mode sites in your Edge default browser settings. 
Once the collection URL is added to IE mode, you may need to refresh the page before you can collect the certificate. You should see an Internet Explorer mode banner if the compatibility settings are correct.
Please note: the details on the collection page may be slightly different than pictured above depending on which Code Signing product you have purchased.
Follow the instructions on the collection page until you see a Web Access Confirmation pop-up requesting permission to perform a digital certificate operation. Click Yes on this pop-up. If you do not see this pop-up, or if you click no, the process will not be allowed and you will not be able to collect your certificate.
After clicking Yes on the Web Access Confirmation pop-up, continue through the collection steps as instructed on the page.
Once the certificate is collected, you can export the file from the browser. Please note that you will not be prompted to download and save the certificate file, instead you must locate the certificate in the browser's certificate store and export from there.
Export Certificate from Edge Browser
After the certificate collection step is done, return to the Edge browser Settings. On the left-hand menu, click Privacy, search, and services, then scroll down to the Security section. Click Manage Certificates.
In the Certificate store window, in the Personal tab, locate your new certificate and click to highlight the file. Click Export.
Proceed through the Certificate Wizard.
On the Export Private Key page, select the option "Yes, export the private key." If this option is unavailable, there is some issue with the key and you may need to re-issue the certificate and start the generation process again.
On the Export File Format page, select the "Personal Information Exchange - PKCS #12 (.PFX)" option, and make sure to check the options to "Include all certificates in the certification path if possible" and "Enable certificate privacy".
On the Security page, check the Password option, then create the new password for the file. You will need to enter this password whenever you install the certificate on a different system.
On the File to Export page, click Browse to select a destination to save the file, and enter a name for the file as well.
Finally, make sure all of the options are correct and Finish the wizard.
When you Finish the wizard, your certificate has been exported! You can now install the certificate on your device or send the file to your technician.