If you are having trouble accessing shared Notes on your iPhone, there could be several reasons why this is happening. Firstly, make sure that the notes you are trying to access have been properly shared and synced with iCloud. If the note has not been successfully uploaded or updated in iCloud, then it will not show up on other devices connected to that account. Additionally, if you do not have an active internet connection at the time of attempting to access the note, it may be unable to load correctly due to a lack of connectivity. Another possibility is that another user has attempted to modify or delete the note while you were away from your device; if this happens, then no other users will be able to view it until they approve any changes made by those who previously accessed it. Finally, ensure that all necessary permissions are given for each user so they can gain full access when sharing notes between different devices and accounts.