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

Access to barcode(s) [LY123456789DE] is forbidden.


This error is usually returned because 
there is an issue finalizing the manifest from Linnworks, but it is likely that the manifest still gets created on the Deutsche Post portal. Please contact Linnworks support when you receive this error and refer to the Shipping team to correct the manifest on Linnworks end.