The error message you're seeing indicates that the request you're sending to the Azure Cognitive Services Face API is invalid. There could be several reasons for this, such as incorrect parameters or missing required information. Check your API key and endpoint.
- Check your parameters.
- Check your image format.
- Check your image size.
- Check your request rate.
If you have tried all of these steps and still need assistance, you may need to provide more information about your request and the specific API operation you're using.