If you couldn’t record a workout for some reason its important to record approximate load for that workout. That keeps the future workouts true and fine-tuned.
To do this first look at your workout history and figure out an approximate load for the missed workout. For eg. a z2 run for 1 hour could be around 80 tss and a z2 1hour ride would be approximately 50 tss.
Then go to intervals.icu. On the calendar click on the day you want to add the load.
Select the workout and make an entry. Manually enter the load in the workout.
This will correct the load calculations in EnduroCo.