Okta Rest User create fails

I’ve something weird and not seen before. We have two Okta environments.
An Okta-preview and an Okta production.
If I’m using Postman to do a User Create Rest-call. It works fine in the Preview, but it doesn’t create the user in Production and returns a list of users…

There is also not an error, the status is just 200 OK. Has anyone a clue what the issue could be?

Kind regards,