I'm currently in two campaigns that have content sharing available, one sharing the sourcebook bundle and one sharing the legendary bundle. Just tried to get on the app and all its constantly pointing me to the marketplace to buy sourcebooks that should be shared with me. Double checked on the mobile website to make sure it's not an app issue and same thing. 

Is content sharing on the fritz or is this just an issue with. Y account?

Are you building those character specifically within those campaigns? You can only access shared content within the specific campaigns that are sharing that content.