Reference: OmniScript Basics - Salesforce
Explanation: To use the OmniScript metadata type, the administrator should enable acustom domain in the Salesforce org. A custom domain is a unique URL that replaces the standard Salesforce domain (such as
https://yourcompany.my.salesforce.com) with a branded domain (such as https://yourcompany.force.com). A custom domain allows users to access OmniScripts and other Vlocity features from a web browser or a mobile app. A custom domain also provides enhanced security and performance for the org.
To enable a custom domain, the administrator needs to do the following steps:
From Setup, in the Quick Find box, enter My Domain, then select My Domain.
Enter a subdomain name and check its availability.
Click Register Domain.
After receiving an email confirmation that the domain is ready, click Deploy to Users.