Watch face FLUX from face gallery on Apple Watch iOS11 not showing in iPhone app iOS18

So here my problem, I just bought a brand new SE and I was forced into iOS 11 upgrade to use my watch.

I chose a watch face from the face gallery when you press + on the Apple Watch and wanted to choose the new Photos but it said I need to go on my iPhone, so I chose the new FLUX face. On my iPhone in the Watch app the FLUX face is nowhere to be found in my faces or the face gallery. When I share to myself the face via text message and try to open the new watch face on my phone it says that the watch face is not available for my Apple Watch model… Same goes for Reflections.

iPhone 15 Pro Max with iOS 18 and out of the box brand new Apple Watch SE 44mm with iOS11.

Thanks