Where are you getting the model number from, if you go into the Help & feedback> Help section of the Settings menu you should be able to get the correct model number. Bottom left of screen.
The one you are showing seems to be too long.
Have a look at the support page for your model of TV and you will notice the model number should be
K-65XR80M2, try putting that in the model number section of the registration page.
https://community.sony.co.uk/t5/forums/replypage/board-id/tv_en_1/message-id/58239
