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There's probably some mismatch in the model number since retailers add/remove or generally adjust the model to fit in their systems.
Can you share it with us so we can try and help with that?
- JD
I have that problem too - trying to register
Sony BRAVIA KD55AG9. The form recognises the model a green tick appears but the form is then unresponsive.
Try using this "KD-55AG9" without quotes, basically a missing dash, this should work properly.
You can also try and omit the 9 at the end "KD-55AG" and choose the model from the drop-down list.
- JD