How to make a backup of your electronic certificate

Windows - Copying the certificate in Microsoft Edge

To copy your electronic certificate from Microsoft Edge, go to the "Settings and more" menu located at the end of the address bar identified by the three horizontal dots icon and click "Settings."

Click on "Privacy, search and services" on the left margin, locate "Security" and click on "Manage certificates".

Your electronic certificate should appear in the "Personal" tab. To perform a backup (export), select the required certificate and click "Export...".

The "Export Wizard" will then open. Click "Next" and then check the "Export private key" box (if you have just obtained your certificate and it cannot be checked, there may have been a problem with the download or installation; In this case, contact the entity that issued the certificate).

On the next screen, leave the options that appear checked by default and click "Next." Check the "Password" box and set a password for security. This option is essential to later import the certificate into a browser such as Mozilla Firefox. If you forget your password, there is no way to recover it. Click "Next".

Click "Browse" to choose the location where the certificate copy will be saved, set a name, and click "Save," "Next," and then "Finish."

If everything went well, the message "Export was successful" will appear.

The icon for a valid copy will be an open envelope with a certificate sticking out and a key and the extension .pfx. If you do not see the extension, right-click on the certificate icon and go to "Properties".

If you fail to check the "Export private key" box, the result would be an invalid copy (the file would have the extension .cer and the icon would be a certificate without any key). The private key is the personal information that the certificate contains and without which signing is not possible.

If the copy were not valid, it would be installed in the "Other people" tab instead of the "Personal" tab and the certificate would not be valid to work on the AEAT page. If at any time you need to reinstall (import) the certificate and you do not have a valid copy, you will need to request a new certificate.