Cannot access Thesaurus endpoint

I am receiving Authentication failed when I make requests to the Thesaurus endpoint. Following is an example:

curl -X GET --header 'Accept: text/plain' --header 'app_id: xx' --header 'app_key: xx' 'https://od-api.oxforddictionaries.com/api/v2/thesaurus/en/tenacious?fields=synonyms&strictMatch=false'

However, the call to the Entries endpoint works just fine. I have checked the app_id and the app_key multiple times and they are correct. I am currently on the Prototype plan. Does one need to be on some other plan to access the Thesaurus endpoint?

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