There are multiple reasons as to why a shared agenda won't download to a user's device.
1) To share an agenda, the admin will have to switch the Approve toggle on in Media Manager > Agendas.
Once this is done, all user's will receive an update via their app and the shared agenda will appear.
2) The user will not receive the shared agenda if they have not checked for an update in settings. Most user's will have this set to check for updates automatically, but a manual check for updates is always recommended.
3) A user must be connected to WiFi in order for an agenda to download. Once the agenda is downloaded, the user will be able to work offline with the agenda ready to go.