Can't create user and assign role on RH-SSO 7.x REST API

Issue

Need to create a user and assign a specific role to this user using the RH-SSO 7.x REST API with the following JSON, however, the role is not applied to this user.

• Request: http://{{host}}:{{port}}/auth/admin/realms/{{realm_name}}/users
• Body

{
        "username": "Strange",
        "enabled": true,
        "totp": false,
        "emailVerified": true,
        "firstName": "Stephen",
        "lastName": "Strange",
        "email": "drstranger@marvel.com",
        "disableableCredentialTypes": [],
        "requiredActions": [],
        "notBefore": 0,
        "access": {
            "manageGroupMembership": true,
            "view": true,
            "mapRoles": true,
            "impersonate": true,
            "manage": true
        },
        "realmRoles": ["admin"]
    }