AEMaaCS GraphQL Web Optimized Images not working

The error is clear the _dynamicUrl field does not exist in the imageRef object, when I look at the references available, I just see this, is it possible you mistaken the name of what you are looking for? Also you can use the "Documentation Explorer" in the right section of the ghrapql UI(http://localhost:4502/aem/graphiql.html)  to check which objects are available like I show below:

Hello @leeasling1 - 

Are you working on AEM on prem or AEM as a cloud service?

As the documentation link that you have shared (https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/headless/graphql-api/content-fragments.html?lang=en#web-optimized-image-delivery-full-parameters) is that of AEM as a cloud service and the _dynamicUrl field for the ImageRef type is not available in AEM 6.5 on-premise or earlier versions. It was introduced in AEM as a Cloud Service and is not available in on-premise deployments.

However, to provide the dynamic URL for an image in GraphQL, you can use a different approach.

Here's an alternative solution you can try:

1. Instead of using the _dynamicUrl field, retrieve the image URL directly from the fileReference field of the ImageRef type.

2. Once you have the fileReference value, you can construct the dynamic URL using the hostname and the path to the image file. In AEM, the image URLs can typically be constructed as follows:https://{hostname}/{path_to_image_file}
   

3. By constructing the URL manually, you can achieve the same result as the _dynamicUrl field, which is to obtain a dynamic URL for the image.