Focus settings do not allow me to add apps to allowed notifications

When I go into Focus settings on my iPhone and attempt to add apps allowed to send notifications in a particular Focus, the list doesn’t include all my apps. For instance, setting up a Fitness focus there is no way for me to allow notifications from the Running by Adidas app – it doesn’t appear in the alphabetical list if I scroll down, nor if I type it into the search field. In fact, scrolling through the list of apps to allow notifications, it is clearly not a list of all apps on my phone.