Cancel a fulfillment ID API Version 2020-01 returned error "An error occurred, please try again"

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Both <Cancel a fulfillment for a specific order ID> and <Cancel a fulfillment> using API version api/2020-01 will return an error.

POST /admin/api/2020-01/orders/#{order_id}/fulfillments/#{fulfillment_id}/cancel.json
POST /admin/api/2020-01/fulfillments/#{fulfillment_id}/cancel.json
(
[errors] => An error occurred, please try again
)

Any idea how to fix it?
I have post with an empty JSON string {}

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