Even though an access token is obtained using JWT authentication, an error occurs when calling the API.

Hello everyone.

As the title says, even though I was able to obtain an access token using JWT authentication,
an error occurs when I call the API.

I'm having trouble with this error, so I wanted to ask.

I'm creating a simple application in C# that calls the API.

I was able to create it without any problems up to the point where I was able to obtain an access token using JWT authentication.

However, when I try to call the BOX API, the following error occurs.

Status Code BadRequest: {"error":"unauthorized_client","error_description":"The \"box_subject_type\" value is unauthorized for this client_id"}

I don't know what causes this error.

If anyone knows, please let me know.

Thank you in advance.