PowerApps DataTable and Gateway connection

I feel like an idiot posting this question, but here goes.

I have added a sql connection to an on-premises test database through a gateway.  While in design mode, I see data from the database populate the datatable.  However, when I access the app in "run" mode, I get the no data text message.

Is there some call or function that needs to happen on load in order for the datatable to populate?