Finish Changing your iCloud Password Prompt / Nag Screen
Around every other day, I receive the prompt to "Finish changing your password":
Your password also protects access to data stored in iCloud. To Finish changing...
I believe the prompt started when I changed my login password to El Capitan, which is not the same password as my iCloud / AppleID password. I have tried to change my iCloud password to get rid of the box but nothing makes it go away, it pops up every few days and continues to pop up now that I upgraded to Sierra.
I'm logged in fine to iCloud and my computer. I don't have any issues with either password, they both work fine.
How in the world do I get this box from nagging me every day? Is there a plist file or some preference I need to delete to make it stop bugging me?