Cannot add dataflow to on prem gateway

Hi, I have a dataflow datasource setup (to Dynamics CRM data) for one of my reports. In this same report we are using an on premise datasource. I want to select the gateway connection to schedule a refresh and it gives me the following error:

It states that the datasource (Power BI Dataflow) cannot be added to the gateway, so I cannot select the on prem enterprise gateway. What can we do to fix this?