The POST /environments/{environmentId}/signOnPolicies/{policyId}/actions operation creates the LOGIN sign-on policy action resource, which is associated with the sign-on policy ({policyId}) specified in the request URL. This action prompts the user to enter a username and password at sign-on.

In this use case, the priority property in the request body is set to 1 (the highest priority) to ensure that the LOGIN action is the first sign-on action.