In my experience, changing the password at big corps usually locks you out and requires a call to IT. I had a success rate of about 50% when I had to change passwords. It was the most frustrating thing...

"Oh yeah your password change properly is not synced to all servers yet. Just wait and try again later"

"Oh you tried the new password too many times while it was not synced yet. Your account is now locked. You need a manager approval to unlock your account."