As a LinkedIn Page super admin, you can control which email domains (such as @yourcompany.com) can be used to verify members’ and super admins' association with your organization. You must include all domains that your employees are likely to use for workplace verification.
When you add a domain, members of your organization and super admins of your page can verify their workplace or education association by confirming that they have an email address with the approved domain (such as name@yourcompany.com). Once verified, the verification will be displayed on the member’s LinkedIn profile in the About this profile section. You can add email domains only on desktop.