Revoke service not working

I tried to run the service in postman,

/auth/realms/{realm name}/protocol/openid-connect/token/revoke

Giving error 404 Not Found
The requested resource could not be found but may be available again in the future. Subsequent requests by the client are permissible.

Input passed are given below,

Headers
Content-Type : application/x-www-form-urlencoded
Authorization : Basic ____

Body → x-www-form-urlencoded
token_type_hint : refresh_token
token : refresh_token