Fitness app not registering workout

I forgot to start workout on a particular day. I realised a couple days later , I used the manual add button under workouts . But it doesn’t update on the fitness app.

no matter what I try it says I haven’t hit my goals because I didn’t register the workout.

so add it manually and still doesn’t register it.

any ideas

ive tried restarting phone and watch, tried unpairing watch and paring. And tried resetting data .