API Integration for List Subscription

I have used JSON type request

The below URL have used in Postman with POST method I need to Subscribe to the list. 

https://campaigns.zoho.com/api/v1.1/json/listsubscribe?resfmt=JSON&listkey=3z53bea72625343059ce128a3a3e06b026a2c1146a8b8f55ccb306d93ac7b94007&contactinfo=%7BFirst+Name%3ASwetha%2CLast+Name%3ALast+Name%2CContact+Email%3Aswethaorchids61%40gmail.com%7D

And I have added my access token to my headers 

I'm getting unauthorized request. What may be the reason. 

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