EtsyError: Could not find a Listing with listing_id = ...

This error occurs when you have the wrong listing_id.

The problem is one of these:

• You didn’t copy-paste the whole listing_id
• You accidentally added numbers to the listing_id
• The listing with this listing_id has been deleted

Etsy does not allow changes to a deleted listing. If you want to make changes, you will have to create a new listing with the same information instead.