This error (An Error Occurred when attempting to: Creating Manifest Error: {"messages": ["contactName: may not be empty. Example: 'paperwork': {'contactName': 'Max Mustermann'}"]}) from Deutsche Post typically occurs due to one of the following reasons:
The Deutsche Post courier account is not filtered by a specific warehouse (it is set to All).
The warehouse associated with the courier account is missing a Contact Name.
To resolve this issue, please review the steps below:
Step 1: Ensure the courier account is filtered by a specific warehouse
Click Connect then Courier Integrations.
Click Deutsche Post then Edit.
Set the Warehouse to a specific one (not All) and click Save.
Step 2: Ensure the warehouse has a contact name
Click Warehouse then Manage Warehouse.
Click Edit on the relevant warehouse.
Enter a value in the Contact Name field (e.g., “Max Mustermann”).
Click Save.