[Apiman-user] logout session from all the application on multiple devices for the current user - not working

I have checked the api from the following url https://www.keycloak.org/docs-api/5.0/rest-api/index.html I have tried this to clear the entire session for the currently logged in user via curl function. $url = {keycloak server}/auth/admin/realms/testotp/users/".$id."/logout $postdata = array( 'refresh_token' => $refresh_token, 'client_id' => 'sso', 'realm' => 'testotp', 'client_secret' => '96835403-30d9-4c8f-b0e0-00e91cb2b481', 'user'=>'9eac87a6-32b3-419d-a690-c5e5aad98245' ); And sets the header assigned with bearer access token. 'Authorization: Bearer '.$access_token, But I got the error code - 403 as response Kindly add some points to help me from logout the current users entire sessions. Thanks and Regards Joyson Anto ~ Aj Antony Joyson M Software Engineer TSG SPi Global M +91 9551347970 M.AntonyJoyson(a)spi-global.com www.spi-global.com<http://www.spi-global.com/> SPi Global - Philippines Best Employer 2018, 13th Employer Branding Awards, Employer Branding Institute - India and 2018's Top 25 AI Companies in APAC by CIO Advisor CONFIDENTIALITY NOTICE: This email, including its attachments, is intended for the use of the person/s it is addressed to. It may contain personal data, or information that is protected or privileged, which are protected from unauthorized use or disclosure by law. If you are not the intended recipient, any dissemination, retention or use of any information contained in this email is prohibited. If you have received this email in error, please promptly notify the sender by reply email and delete the original email and any backup copies without reading them. If you have questions or clarifications regarding any matter relating to data protection, you may write to the SPi Global Data Protection Office at dpo(a)spi-global.com. You may also file a complaint or report a security incident involving personal data by writing to: dpo(a)spi-global.com.