Rowing workouts no heart rate readings

During my rowing workouts my Apple Watch ultra 1 doesn’t give me any heart rate readings. I’ve tried different bands and cleaned the back of the watch with no prevail. Cycling and weights training and the heart rate is displayed and works fine. Anyone else with the same issue?

During my rowing workouts my Apple Watch ultra 1 doesn’t give me any heart rate readings. I’ve tried different bands and cleaned the back of the watch with no prevail. Cycling and weights training and the heart rate is displayed and works fine. Anyone else with the same issue?