To maximize the availability of your orgs, My Domain uses partitioned domains for new Developer Edition orgs, patch orgs, scratch orgs, demo orgs, and Trailhead Playgrounds. Partitioned domains include a word related to the org type so that Salesforce can gradually roll out service-delivery changes. This feature is enabled by default in new qualifying orgs, and sandboxes with enhanced domains are always partitioned. To ensure continued access to all your orgs, update your allowlists for the new domains. To include your existing org in the Salesforce deployment schedule for that org type, enable and deploy partitioned domains.
Where: This change applies to non-production orgs with enhanced domains in Lightning Experience, Salesforce Classic, and all versions of the Salesforce mobile app in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions. The scratch partition is newly available if you use Salesforce Edge Network. Only the sandbox partition is available in Government Cloud—Defense orgs. Partitioned domains aren’t available in Trailhead Playgrounds on Salesforce Edge Network.
How: To ensure that your users can connect to partitioned domains, update your allowlists.
In existing demo orgs, Developer Edition orgs, patch orgs, scratch orgs, and Trailhead Playgrounds with enhanced domains, you can enable or disable this feature from the My Domain Setup page. When you enable the Use partitioned domains option in the My Domain Details section, you can preview your new My Domain login URL at the bottom of the screen. To use partitioned domains, save the change and deploy your new My Domain.