在属性名称中，您有一个错字:

In the property name, you have a typo:

public static readonly BindableProperty SkuPoperty = BindableProperty.Create(nameof(Sku), typeof(ApiModels.SkuDetailModel), typeof(AddToCartButton));

SkuPoperty => SkuProperty

SkuPoperty => SkuProperty

详细说明，Xamarin 需要具有 PropertyNameProperty 命名约定:创建可绑定属性

To elaborate, Xamarin requires to have PropertyNameProperty naming convention: Creating a bindable property