Cannot find Youtube channel membership API

I have a creator account (saiupigliamosche) with partnership enabled.I'm trying to enable the youtube channel membership API, but I cannot find it in the google cloud console.

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I am stuck, I need help.Thanks

I tried also to use API via google developers website (https://developers.google.com/youtube/v3/docs/members/list?hl=it&apix_params=%7B%22part%22%3A%5B%22snippet%22%5D%2C%22managedByMe%22%3Atrue%7D)

but I keep getting the following error:

{"error": {"code": 400,"message": "The channel does not have Channel Memberships enabled.","errors": [      {"message": "The channel does not have Channel Memberships enabled.","domain": "youtube.member","reason": "channelMembershipsNotEnabled"      }    ]  }}