I am a student using the Canvas app on my Android phone and I have uninstalled and reinstalled several times. Every time I try to access the calendar on the app I get the message "You are unauthorized to access this. Either you don't have permissions or you don't have access yet." I am able to access my calendar on the computer but on my phone it won't let me. I haven't had this issue before, is there anything I can do to resolve this?