No ECG app on Forerunner 970 after completing initial setup

Yesterday, after unboxing my new 970, I completed the initial setup, which included setting up the ECG app (I'm in the US, so theoretically I should have access to the ECG app). I completed the setup and took the initial ECG reading (which was "inconclusive" as my heart rate was too low). At some point afterwards, I installed an available software update for the watch. Since then, I have not been able to take another ECG reading—as far as I can tell, there is no ECG app installed on my watch. It's not in the activities & apps menu on either the watch or Garmin Connect. It's not in the glances or controls either. Going to Health > ECG in Garmin Connect only shows the initial ECG reading I took. The Finish Setup menu in Garmin Connect is gone (since I finished it), so I can't go through the "Set Up ECG App" step again. I've tried restarting the watch, restarting Garmin Connect, syncing the watch through wi-fi—nothing worked, the ECG app is just gone.

Any ideas on how to get it back?