Good morning - thanks for the reply. When I open the dashboard then select the tab with the map (using the ArcGIS for PowerBI control) it flashes what seems to be another screen but then goes to the map. If the image comes through you can see when I click on Layers they are the ArcGIS Online layers. The layer in the background though comes from our ArcGIS Enterprise server (I didn't include more of the map in the screen capture as some of the data is licensed but you can see the blue lines which is from that layer).
I don't seem to be able to see the layers on our Enterprise server and it seems to suggest if I click on the account icon that I should sign in but there is no where to update the credentials or point it back to our Enterprise URL.