(This is a re-post because my first question has since one month the status "This post is currently awaiting moderation. If you believe this to be in error, contact a system administrator." And I don't know how to contact a system administrator)
I can migrate "normal" listings to Inventory API Objects without any problems but the migration of variations listings returns the following error:
[errorId] => 2003
[domain] => ACCESS
[category] => APPLICATION
[message] => Internal error
[longMessage] => There was a problem with an eBay internal system or process. Contact eBay developer support for assistance
[parameters] => Array
 => Array
[name] => reason
[value] => Failed to transform underlying error response, see logs.
Making the call to:
Authorization: Bearer $userAccessToken2h
As said, when I set listingId to a non-variation listing everything is fine. What am I doing wrong?