Hi,

As you are sending HTTP format, please ensure use the body format below:

 

past this content in the body field and try again:
 

{"query":"mutation {\r\n  updateCardField(\r\n    input: {card_id: 1146321608, field_id: \"status\", new_value: \"new value text9\"}\r\n  ) {\r\n    clientMutationId\r\n  }\r\n}\r\n","variables":{}}

Regards

Joao Quint