Asking to change passcode

No, most likely that's a scam meassage. Ignore / delete it, and DO NOT give any personal info to anyone.

See this: Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Regards

Giulio

Apple will never ask you to change the passcode to your device. However, if you have an Exchange email account through an employer, they may be requiring the passcode change.