Validation Error for HTTP Callout

I am experiencing a validation error with my http callout.  I'm trying to access this api:

https://opendata.dc.gov/datasets/DCGIS::purchase-card-transactions/api

The url for the JSON Response is here:

https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Public_Service_WebMercator/MapServer/50/query?where=1%3D1&outFields=*&outSR=4326&f=json

I added the JSON Response URL to my external credential

When I create an HTTP callout in the flow, I don't add anything to the header or any query parameters

I can successfully connect to the schema:

However, I immediately get a validation error when I test the flow:

Any advice would be appreciated

#Flows #HTTP Callouts