Nifi dont work Oauth 2

[#1]

I have an error. I think it's problem, because i send it as a body, but i need send it as a header "authorization ..." 

StandardOauth2AccessTokenProvider[id=5ab93fb7-ab93-1a47-1231-ee6161ae671c] OAuth2 access token request failed [HTTP 401], response:

<UnauthorizedException><error>unauthorized</error><error_description>Full authentication is required to access this resource</error_description></UnauthorizedException>