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

(401) Unauthorized 


This error is being returned, because there are incorrect credentials in > Shipping > Integrations > DPD Config. DPD credentials need to match with MyDPD credentials that you use to log in to DPD portal. If the password was updated but the error remains, please contact Linnworks support to revoke the daily access token.