Deploy a My Domain (Update)
Where: This change applies to Lightning Experience and Salesforce Classic in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
When: Salesforce enforces this update in Winter ’22. To get the major release upgrade date for your instance, go to Trust Status, search for your instance, and click the maintenance tab.
Who: This update applies to orgs without a deployed My Domain at the start of Winter ’21.
Why: Deploying a My Domain brands your login URL with your chosen My Domain name. It also removes the instance name from your login URL, preventing user login disruption if your org moves to another Salesforce instance. You must have a My Domain to set a custom login policy that determines how users are authenticated. A My Domain is also required to set up single sign-on (SSO) with external vendors and to use newer services like Customer 360. Some Lightning container components and web security protections require a My Domain as well.
How: We recommend that you deploy a My Domain in a sandbox and test connectivity across your org before deploying in production.
To complete this update, from Setup, in the Quick Find box, enter Release Updates, and then select Release Updates. For Deploy a My Domain, follow the testing and activation steps. See My Domain in Salesforce Help for details on how to set up, test, and deploy a My Domain.
If you don’t deploy a My Domain before the enforcement date, Salesforce sets one for you based on your org’s company name. If you prefer to use a different name, you can change your My Domain after we set it.