'Text' won't reference from the REST API selected in the 'fetch' component

Hey all!

I have a text block nested within a fetch component. The fetch component has a set service and endpoint (screenshot1), but the text component nested within it cannot reference from that service and end point . It just doesn't show as an option in the dropdown when I set a {{variable}} (screenshot2). 






The same service and endpoint are working in another fetch component on another page so I'm very confused!

Am I doing something silly or is this a bug? 
Thanks!