How to set up an API Call for YouTube Data API? error code: 403, "Forbidden"

I'm trying to change the thumbnails and title of a video on my YouTube channel using this API Call which I make from a web-app on Bubble.io Printscreen of API Call for Make changes to user's videos

In Playground YouTube everything goes fine, the request works, the name of the video on the main YouTube channel changes, but the exact same json in bubble.io

{"id": "-d4cbswHuSE","snippet": {"title": "TESY api.","thumbnails": {"default": {"url": "https://i.ytimg.com/vi/HCkvoed2iII/default.jpg"      }    },"categoryId": "22"  }}

gives this error:"forbidden (403) forbidden Access forbidden . The request may may not be properly authorized"

Can you tell me what the problem could be? Maybe someone has already experienced something like this? Prinscreen of error