Dude. It's a pain in the ace and it's definitely trial and error.
Obstacle 1. You hafta scoup out enough avocado for the egg to fit.
Then you have to decide how well you want the egg cooked.
Optional. I put fresh diced garlic and olive oil in first. Then the egg.
Depending on your air fryers wattage, I'd start at 400° for about 8 minutes. See how the egg is cooked. Then adjust.
I haven't tried it in my new one and it goes up to 430°. The hotter the better. Cook the egg faster as to not cook the avocado as much would be a plus.