priorityListing Returns empty on my APP but has a vaule in the Explore

[webstep2]

Hi all I am trying to fetch  the priorityListing   value from the browse API

I can see the results in the testing environment (eg eBay Explore)
but when calling the same item via my app I receive an empty value,

Any Ideas. is this a bug 

https://api.ebay.com/buy/browse/v1/item_summary/search?q=drone&limit=3 

ebay result 
"topRatedBuyingExperience": true,
"priorityListing": true,
"listingMarketplaceId": "EBAY_US"


My Result 
[topRatedBuyingExperience] => 1
[priorityListing] =>
[listingMarketplaceId] => EBAY_US