Make sure that the images you are using are clear and well-lit, with your face in the middle of the frame. You could also try using different images to see if that makes a difference.
Choosing the original portrait correctly is the key to success. Don't upload group photos, cropped images, photos with shadows on the face, taken from too close or too far away distance, hands or other objects close to the face, partially covered face, unusual angles, etc.
It should be a headshot, not a full body image.
Also, make sure that you have an excellent and stable internet connection, as the loading issues can affect face recognition, too.
Additionally, you could reach out to our customer support for further assistance in troubleshooting the issue.