Yes, I got about 5 of these day, sent to all my adwords and google analytics accounts.
I really don't get what they want me to do, as far as I know my adwords and analytics accounts ARE correctly linked together, never had a problem in the past.
Theres so many options as to why you might get the email, i`m really not sure which one of them it is.
So, I have just decided to ignore it
I wonder whether it was sent accidentaly, and instead of being sent to a certain group of people it was sent to everyone.
I got an email a couple of months ago from Google, demanding to know what I didn't have adequate funds to pay my adwords bill, although the adwords account in question was actually someone elses and the email was sent to me mistakenly.