I'm inserting a post via wp_insert_post() and in the $args the tax_input looks like this:
'tax_input' => array( "programmas" => 'Modern Family', "zenders" => 'ABC', ),
But what is happening: the "programmas" is correctly inserted but the "zenders" is not. I'm 100% sure that I've spelled these custom taxonomies correctly. When running the function, a post is correctly inserted except for the "zenders" part.
I have all the capabilities, because I am the administrator and I've inserted my user id in the "post_author" part.