When I am using the plugin like below, it works fine:

httpRequest customHeaders: [[name: 'Authorization', value: "Token harcodedtokenvaluehere"], [name: 'accept', value: "application/vnd.github.v3+json"]], httpMode: 'POST', requestBody: '{"head":"head","base":"base"}', url: "myurl"

But when I try to use withCredentials to pass Token value through Jenkins credentials, job fails with Response Code: HTTP/1.1 401 Unauthorized.

withCredentials([string(credentialsId: 'githubToken', variable: 'TOKEN')]) {

   httpRequest customHeaders: [[name: 'Authorization', value: "Token %TOKEN%"], [name: 'accept', value: "application/vnd.github.v3+json"]], httpMode: 'POST', requestBody: '

', url: "myurl"

}