I have tried printing a Deutsche Post shipping label and am seeing an error returned:

The given data contains invalid control characters. Characters with the following ascii decimal codes are not renderable: [1593, 1576, 1583, 1575, 1604, 1585, 1581, 1605, 1606, 1605, 1581, 1605, 1583]


The error means that the order address details contain non-Latin characters which need to be manually replaced with Latin characters.