Issue when using a green screen with virtual backgrounds

I am trying to use a green screen with a virtual background, but it is not rendering properly. When I select the "I have a green screen" it is showing only a silhouette of me embedded in the background. I am unable to select the color option as shown in your tutorial. I only get a question mark, but no option to select the correct green color. When I deselect the "I have a green screen" checkbox, I can see myself, but not fully rendered, no earrings, etc. Looks very weird.