Getting error "Nullability Mismatch on variable $fulfillment....." when invoking a graphQL mutation

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Nullability Mismatch on variable $fulfillment and argument fulfillment (FulfillmentV2Input/FulfillmentV2Input!)

After failing to call the fulfillment API using Rest, I went ahead with integrating the same thing using GraphQL but I am unable to understand why I am encountering this error.

Documentation for reference:


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