Trying to create checkout with shipping line and getting invalid response

Hello,

I am trying to create checkout using Admin REST API but whenever try to send the payload with the shipping line the API is giving me a shipping line invalid error with a 422 status code. I need to create the checkout with the shipping line as it can’t complete checkout without it. My X-Request-ID is 57d0d37a-935d-4bed-8bac-191f20113a62. I am also attaching the payload.

Thanks