Clarify DR support ticket requirements and fix EMU sign-in wording (#60776)

Co-authored-by: Isaac Brown <101839405+isaacmbrown@users.noreply.github.com>

Author: eyalgal

content/support/contacting-github-support/creating-a-support-ticket.md

@@ -78,13 +78,15 @@ Especially for tickets with {% data variables.product.support_ticket_priority_ur
 
 ## Creating a support ticket{% ifversion ghes %} using the {% data variables.contact.enterprise_portal %}{% endif %}
 
-> [!NOTE]
-> Before you submit a ticket, you have the option of using {% data variables.copilot.copilot_in_support %} to receive an immediate response to your question. If {% data variables.copilot.copilot_in_support %} is unable to resolve your issue, you can continue submitting your ticket. For more information, see [AUTOTITLE](/support/learning-about-github-support/about-copilot-in-github-support).
+Before you submit a ticket, you have the option of using {% data variables.copilot.copilot_in_support %} to receive an immediate response to your question. If {% data variables.copilot.copilot_in_support %} is unable to resolve your issue, you can continue submitting your ticket. For more information, see [AUTOTITLE](/support/learning-about-github-support/about-copilot-in-github-support).
+
+> [!IMPORTANT]
+> If your enterprise uses {% data variables.enterprise.data_residency_short %}, you must sign in with your {% data variables.enterprise.data_residency_site %} account when creating a support ticket about your data-resident enterprise. Otherwise, you will be asked to open a new ticket using your {% data variables.enterprise.data_residency_site %} account.
 
 1. Navigate to the {% data variables.contact.contact_landing_page_portal %} and choose one of the following options:
 
    * To sign in with your {% data variables.product.github %} account, click **Sign in with {% data variables.product.github %}**.
-   * If your organization uses {% data variables.enterprise.data_residency_short %} or {% data variables.enterprise.prodname_managed_users %} (accounts ending in `.ghe`):
+   * If your enterprise uses {% data variables.enterprise.data_residency_short %} (you will use a domain like `{% data variables.enterprise.data_residency_example_domain %}`):
       1. In the sign-in dialog, click **Sign in to your .ghe account**.
       1. Enter your enterprise or tenant name (provided by your administrator) and continue.
       1. Complete the SAML authentication process as prompted. This will sign you in to your .ghe enterprise-managed account.