screen mirroring iphone to mac with quicktime

Hi All,

I'm using Quicktime - record a movie function - to display my iphone screen to Mac so I can share the same through video conferencing.

It has been working so far, but now the iphone screen is not coming up any more in the quicktime selection.

Camera and iphone camera and mic are there.

devices are:

iPhone 14 iOS 17.6.1

Mac Pro M1 Sonoma 14.5

the two are connected through lightning cable.

thanks for your suggestions