[Hubspot API] How do you use IN filter operator?

Hi! I have a problem when trying to search products using custom property. When I use “EQ” operator I’m getting a product as a result:

{ "filterGroups": [ { "filters": [ { "value": "VKBA 1355", "propertyName": "litium_productarticlenumber", "operator": "EQ" } ] } ], "properties": [ "litium_productarticlenumber" ]}

But when I try to do same search (and search with more values) using “IN” operator I’m not getting anything:

{ "filterGroups": [ { "filters": [ { "values": [ "VKBA 1355", "VKBA 3434" ], "propertyName": "litium_productarticlenumber", "operator": "IN" } ] } ], "properties": [ "litium_productarticlenumber" ]}

What am I doing wrong?