Create an identity preference in Keychain Access on Mac
Some secure websites or email servers may require you to use a client certificate to identify yourself as part of their login security. If you use multiple client certificates, you can create an identity preference that specifies which certificate to use when you log in, so you don’t have to select it each time.
Create a new identity preference
In the Keychain Access app
on your Mac, select “login” in the Keychains list.Select My Certificates in the Category list.
Do one of the following:
Select the identity certificate you want to use and choose File > New Identity Preference.
Choose File > New Identity Preference, click the Certificate pop-up menu, then choose the certificate you want to use.
In the Location or Email Address box, enter the location (URL) or the email address for which the certificate is required.
Click Add.
To review the identity preferences you’ve created, click the Kind column heading while you’re viewing your certificates, then look for “identity preference” in the Kind column.
Remove an identity preference
In the Keychain Access app
on your Mac, select “login” in the Keychains list.Select All Items in the Category list.
Click the Kind column heading to sort all items by kind, then scroll down until you see your identity preferences listed.
Select the identify preference and press Delete, then click Delete.