DHL Express – API Connection StatusClient error: resulted in a `400 Bad Request` response

API Connection StatusClient error: `POST https://express.api.dhl.com/mydhlapi/rates` resulted in a `400 Bad Request` response

Please ensure that you registered your DHL Express account as described in our article:
https://octolize.com/docs/article/dhl-express-how-to-register-an-account/

Then, you need to get the DHL REST API Key and Secret:
https://octolize.com/docs/article/dhl-express-how-to-get-the-dhl-rest-api-key-and-api-secret/

After completing these steps, please verify if the issue has been resolved.