Add service account info to mandatory 2FA doc (#47811)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: joshuawalker

content/authentication/securing-your-account-with-two-factor-authentication-2fa/about-mandatory-two-factor-authentication.md

@@ -87,6 +87,10 @@ If you have been selected for mandatory 2FA, you must enroll in 2FA on {% data v
 
 When you log in to {% data variables.product.prodname_dotcom_the_website %}, email verification does not count as 2FA. Your account's email address is used for password resets, which are a form of account recovery. If an attacker has access to your email inbox, they can reset the password for your account and pass the email device verification check, reducing your account's protection to a single factor. We require a second factor to prevent this scenario, so that second factor must be distinct from your email inbox. When you enable 2FA, we will no longer perform email verification on login.
 
+### About service accounts and mandatory 2FA
+
+Unattended or shared access accounts in your organization, such as bots and service accounts, that are selected for mandatory two-factor authentication, must enroll in 2FA. Enabling 2FA will not revoke or change the behavior of tokens issued for the service account. {% data variables.product.prodname_dotcom %} recommends securely storing the TOTP secret of the service account in shared credential storage. For more information, see "[AUTOTITLE](/organizations/keeping-your-organization-secure/managing-two-factor-authentication-for-your-organization/managing-bots-and-service-accounts-with-two-factor-authentication)."
+
 ## About your privacy with mandatory 2FA
 
 If you have been selected for mandatory 2FA, that **does not** mean you have to provide {% data variables.product.prodname_dotcom %} with your phone number. You only have to provide your phone number if you use SMS for 2FA. Instead, we recommend configuring a TOTP app as your primary 2FA method. For more information, see "[AUTOTITLE](/authentication/securing-your-account-with-two-factor-authentication-2fa/configuring-two-factor-authentication#configuring-two-factor-authentication-using-a-totp-app)."