Unfortunately that does not work with Mastodon. When you view a user's profile instead of loading their current list of Activities Mastodon will only show you t

Unfortunately that does not work with Mastodon. When you view a user's profile instead of loading their current list of Activities Mastodon will only show you the ones which have already been propagated and cached on the current instance. In the case of a static list of activities that won't work. In my opinion it's a mistake to keep functionality like this, and there is a bug report on their tracker about it but I don't think it gathered enough interest from the devs to make it better.