Getting 400 Bad Request Error

HI Team,

I am trying to add one ENV variable in a particular GitLab Project by following below command. So I collected info and put into Postman. But repeatedly I am getting {“error”:“key is missing, value is missing”} error with 400 Bad request status code. Could you pls guide me where I made mistakes.

Command:
curl --request POST --header “PRIVATE-TOKEN: <your_access_token>”
https://gitlab.com/api/v4/projects/1/variables” --form “key=NEW_VARIABLE” --form “value=new value”