I need help with Marketing Cloud MobileConnect.
Is it possible to link a keyword and a ShortCode to a contact number per REST API?

I found the example below in the documentation, but it does not work.

Example QueueMO API Request

    POST https://YOUR_SUBDOMAIN.rest.marketingcloudapis.com/sms/v1/queueMO
    Content-Type: application/json
    Authorization: Bearer YOUR_OAUTH_ACCESS_TOKEN
    {
      "mobileNumbers": [
        "15555551212"
      ],
      "shortCode": "Code",
      "messageText": "KEYWORD"
    }

[Mobile Connect API documentation][1]

  [1]: https://developer.salesforce.com/docs/atlas.en-us.noversion.mc-apis.meta/mc-apis/using-the-mobileconnect-api.htm