Hi @JeremyW.54238 (Customer)​ , Thank you for reaching out to the Okta Community! 

Okta determines which brand's emails to send based on the URL (domain) the user interacts with.

Here's a breakdown to understand Multi-Brand Email Logic:

• Domains are Key: Each custom brand in Okta needs to be associated with a unique custom domain (e.g., login.company1.com, sso.company2.com).
• Request Host Matters: When a user accesses an Okta-hosted page (like a sign-in page, activation link, or password reset link) through a specific custom domain, Okta uses the "request host" (the domain in the URL) to determine which brand's assets (including email templates, logos, and styling) to apply.
• Admin Console Limitations: If you initiate an action from the Okta Admin Console (e.g., manually sending an activation email), it generally uses the default Okta brand or the brand associated with your main Okta subdomain, not necessarily one of your custom brands. 
• API for Branded Activations: To ensure new user activation emails are branded, you'll often need to use Okta's API to trigger the activation process, specifying the custom domain associated with the desired brand.

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Hope my answer helps! 

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