ECG not recognizing finger

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Let me see if I can be of any help.

Try placing a different finger on the digital crown.

My fingers get in pretty rough shape in my line of work (callous, burns, and rough). Sometimes I just use my pinky finger.

I believe, and I could be wrong, the reason for placing a finger on the digital crown is just to 'ground' the watch. So... which finger doesn't matter as long as it's a finger providing a good connection.

Also, a new update (watchOS 9.3) was just released yesterday (January 23rd). Try updating to it too.