iPhone XS - settings Face ID & Passcode not available
I have just had my one month old iPhone XS replaced by Apple Store (ringer failure). After setting up the new phone through iCloud backup, I noted that under settings the option that I had on previous phone (and I see on other X phones) "Face ID & Passcode" is not visible. Using the Setting search bar for "Face ID" only brings up Face ID & Attention (accessibility). I have erased all settings and again restored but same issue. IOS 12.1.4 installed. So I am unable to re-do Face ID if needed and unable to change the Passcode.
How can I get the complete Settings option menu?