My advice is just to ignore it as well. I wouldn’t even take the time to respond, explaining that if this email is genuine, then it is a mistake.

I had an email last year from what was supposedly eBay and it told me that eBay was updating its records (!!) so it requested my user names and passwords for both that and PayPal. Stupid me happily sent the information back via email.

A couple of minutes later, I realised my mistake and quickly changed all the passwords.