INVALID_API_KEY error on flight history

I am trying to fetch flights history by ident number and using GET /history/flights/{ident} api. But it always returns INVALID_API_KEY error. However if I try to fetch aircraft owner details by ident number using GET /aircraft/{ident}/owner api, it perfectly works and returns owner details. I am using same api key in both cases but I noticed that all the apis related with flight history are returning INVALID_API_KEY error but other apis related with aircraft are working fine.

See below image, with error from api.

Any help suggestion is appreciated.

Thanks.

Historical flight data is not available on the Personal tier. You must be on a Standard or Premium tier.