I am working in a managed PW workspace and getting the Linked XIN was proving problematic - I have other posts that point out one potential issue. The XIN had an non-synchronized FeatureCategoryCollection where the Feature Style/Names it contained were drastically different than the FeatureStyleCollection/FeatureStyle/ItemNames. Once I corrected those, the linked worked and finally the Feature Styles lists were populated.
Someone needs to look at how these lists get messed up.
Someone needs to look at how these lists get messed up.