getting error of 400 on creating shipment for an order magento 2.3.1p

Question

showing error while sending this request

[URL=https://.in/rest/V1 /order/330/ship, METHOD=POST, HEADERS={Authorization=Bearer *******************, Host=.in, Accept=application/json, Content-Type=application/json}, BODY={"appendComment":true,"comment":{"comment":"*******"},"items":[{"orderItemId":"857","qty":1}],"notify":true,"tracks":[{"trackNumber":"test12","carrierCode":"custom ","title":"self"}]}, PROXY-HOST=null, PROXY-PORT=null]

Http Sender warning url:https://toothless.in/rest/V1/order/330/ship, status code:400