I am trying to add a new postal service (Service - Priority, Country - USA, Vendor - USPS), but it keeps popping this Error message.
What's it means?
Thank you very much for bringing this to our attention. Please be advised that I have replicated the error on my test account and we will commence working on a resolution as soon as possible. I have raised a ticket on your behalf and will update you in the ticket directly.
As a temporary workaround I would suggest that you add your Postal Services via linnworks desktop.
Apologies for the inconvenience this issue may be causing you.