No notification of missed FaceTime call

I’ve recently upgraded from the iPhone 6 to XR and since a few people have tried to FaceTime me and I’ve missed the calls whilst my phone was locked and in sleep mode. But when I wake the phone to see my notifications on the locked screen is doesn’t display the fact that I missed a FaceTime call, there’s not even a red circle on the phone icon which displays the recent calls to say I’ve missed a FaceTime call, the only way I know I’ve missed a FaceTime call is to go to my call history but because there’s no notification of a missed FaceTime call I don’t know unless I go to the recent list. Anyone know what’s going on, I’ve tried changing the notification settings with no luck.