{“status”:“error”,“diagnostic”:{“validationError”:“Error in $.backupPhrase: Forbidden Mnemonic: an example Mnemonic has been submitted. Please generate a fresh and private Mnemonic from a trusted source”},“message”:“JSONValidationFailed”}
As you see in the Error message, you are using an example mnemonic, you need to generate a fresh and private mnemonic to create a wallet. Your syntax is fine, you have just not replaced the seed words