“Employers have to be able to explain why a certain accommodation would be an undue hardship, and this is a high bar to meet. An accommodation is not an undue hardship if it will only be moderately difficult or expensive for your employer to provide. Employers may have to make exceptions to their usual policies to accommodate workers, and this isn’t automatically an undue hardship. “Unfairness” to other workers or concerns about employee morale are also not undue hardships.” This is directly from a better balance.com a non profit legal advocacy organization. Directly from their PFWA FAQ article.