PulseOX and Body Battery No Longer Recording Data

I have a Garmin Instinct Solar, and I have it paired to my iPhone XR. Stress Level and Body Battery have not been recording since Dec. 30, 2020. When I go to the Stress Level widget, it attempts to take a measurement for 30 seconds, tells me to keep still, and then a message displays saying, “Check Watch Fit”. I have done this several times, with several different strap positions/tightness on my wrist. The Stress Level recorded data just fine the way I normally wear my watch everyday. Not sure what’s going on.