If an Auth Provider is configured in the Authentication Service on the My Domain Authentication Configuration section of the Source Org, this configuration is not copied during Sandbox Create, Clone, or Refresh. As a result, the Authentication Service in the Target Sandbox defaults to Login Form (the default value).
Scenario: "For example, a company uses Okta as a Social Sign-On provider via an Auth Provider on My Domain. After refreshing their UAT sandbox, their QA team cannot log in via Okta because the Auth Provider configuration was not copied."
Sandboxes Create/ Clone/ Refresh do not copy the Authentication Configuration from the Source Org to the Target Org. As the AuthConfig & AuthConfigProviders data is not designed to be copied.
1. Click on Setup.
2. In Lightning Experience, follow the click path: Setup | Company Setting | My Domain. In Classic, under "Domain Management," click My Domain
3. Navigate to the Authentication Configuration section on my domain page
4. Edit and add the required Authentication Service that is configured on Source
5. Click Save
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