Populate a drop down from a service call

Hi,

I have a scenario that in my input form there is a form with fields Application ID, Entity Name and Entity Type:

Here App ID and Entity Name are static field BUT Entity Type is a dynamic field(or Entity Type Dropdown). Entity Type will get Entity Types from a service. For service there is requirement to have AppId in header to get entity types of specific application so here I am trying to use: 'appId': '{{bundle.inputData.app_id}}'.

// Configure a request to an endpoint of your api that
// returns custom field meta data for the authenticated
// user.  Don't forget to congigure authentication!

const options = {
  url: 'https://myserver.com:91/api/db/GetAllEntitiesOfDb',
  method: 'GET',
  headers: {
    'Accept': 'application/json',
    'appId': '{{bundle.inputData.app_id}}'
  },
  params: {

  }
}

return z.request(options)
  .then((response) => {
    response.throwForStatus();
    const results = response.json;
    var entities = [];

    for(const en in results.data){
      entities.push(en.Entity);
    }

    let result = {
      key: 'entity_type',
      choices: entities  
    };

    // modify your api response to return an array of Field objects
    // see https://zapier.github.io/zapier-platform-schema/build/schema.html#fieldschema
    // for schema definition.

    return [result];
  });

So when user will enter App ID in form same App ID will be required to get entity list from service, note that I have also enabled ‘Alter Dynamic Field’ check in App ID but this whole thing is not working Dynamic Field is not appearing. Please let me know what I am missing. Please let me know if further details are required.

Thanks,
Mustafa