Deutsche Post - items[0] Destination country is invalid for this product

If you are trying to create a shipment for an order with Deutsche Post but get an error message (items[0] Destination country is invalid for this product. Error:The remote server returned an error: (422)​​​​​​​), this is because the Shipment Destination, cannot support the service you have selected.
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An example of this is, when a tracked service has been selected, and when creating the shipment, the error appears. This will be because Deutsche Post does not support this Tracked service to the destination.
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To resolve the issue, would be to either contact Deutsche Post to check the service is valid for the destination or, to change the selected Courier Service.