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

(401) Unauthorized 


This error is being returned, because incorrect credentials are entered in > Shipping > Integrations > DPD Config. DPD credentials need to match with MyDPD credentials that you use to log in to DPD portal. 

DPD UK portal:

DPD Local portal:

If the password was updated in the config but the error remains, please contact Linnworks support to revoke the daily access token.