Mouthfull0fBees

I'm rather new at this game and I've been trying to test the TD-12 Decoupler splashed down for an embarrassing amount of time. I've been spishing and splashing in the water with the coupler active, inactive, upside down, right side up, I've activated it in the water, all of it. But I can't seem to get the contract to accept that I'm doing what they want. Is there something I'm missing here?