Shipping Notification not being sent to OTTO - Help needed!

Hi Plenty Community,

I really need some help regarding Sending Shipping confirmation to OTTO Market.
We used to manually fulfill every order to Marketplace Portals. But we are going LIVE on Netto/Marktkauf next week so we wanted to switch to Plenty Event Actions.

This is what I’ve configured based on the Manual already:

  1. The return label is created successfully when order is in status 5.

  1. When Tracking number is imported in Plenty the status successfully changes to Outgoing Items Booked | Status 7


3. So when the tracking number is added and the status is changed to Status 7(Outgoing items booked):
I want the order to be Booked and the Shipping confirmation sent to OTTO

Can you please let me know if my events are correctly set up or am I missing something here?

These are the errors on the logs:

Also I am getting this error frequently these last days:

If anyone could help it would be greatly appreciated since Plenty is not giving me any help at all.

All the best,
Ramadan