In case anyone else changed their password to something absurdly long only to run into the same trouble I did:<p>Apple passwords have a max length of 32 characters.<p>Unfortunately, the change password page doesn't enforce this limit and will blissfully let you think you've changed your password to something that has 50 characters, but actually only stores 32.<p>Later, when you use a Password Manager that saved the full 50 characters, suddenly your password doesn't work.<p>Some Apple pages' login password fields cut off automatically at 32, which lets the pasted password work (as you can't paste more than 32), but this is not the case within iTunes itself or on the iPhone.<p>Solution: Apple needs to limit the new password entry fields on the My Apple ID -> Password and Security page to 32 characters. Or, alternatively, accept and store longer passwords. (as 32 characters is a bit tight if you're using a passphrase)