Create URL in Shortcuts app that contains two variables

This is the URL:

https://api.tomorrow.io/v4/weather/realtime?location=[Coordinates]&units=imperial&apikey=MyAPIKey

Where `[Coordinates]' is something like `33.4.-117.5'

I can get lat and long from Get current location, but can't form them into an acceptable URL

Text action: Latitude, Longitude

then

Set variable Coordinates to Text

Doesn't work. And many other combinations, but haven't hit the right one.

I am creating the Shortcut on Mac, then running from iPhone. I can sometimes run from the Mac, but then if I try again it fails.

Am I missing how to tag this with the Shortcuts app?