Geoform requires editable feature in Portal, but my hosted feature is editable?

[JasonCarter1]

I'm attempting to make a Geoform to edit a feature service in Portal for ArcGIS. I am receiving the error here:

However, my layer is set to be editable. What could be causing this issue? Am I missing something about how to set up the hosted feature? 

Screenshot of the features settings:

Thanks in advance.. 

[BruceAnderson1]

I'd try unchecking the Enable Sync option and see it that makes a difference.  

[JasonCarter1]

Thanks for the reply. That didn't seem to work. I am still not able to select a layer. I modified the editing capabilities in Portal after publishing the service from ArcMap. Do you think I need to publish it as editable rather than changing the permissions after the publishing? I'll go ahead and give that a try..

Thank you

[JasonCarter1]

After further research it appears that polygon features are not usable in the GeoForm... is that correct?