To prevent the pretzel coating from becoming soggy, make sure your air fryer is preheated before adding the chicken. Preheating helps create a crispier texture. In addition, do not overcrowd the air fryer basket, as that can trap steam and lead to sogginess. Arrange the chicken pieces in a single layer with some space between them for proper air circulation. Make sure to spritz with a bit of oil to help with crisping as well.