When trying to use the ParameterizedRemoteTrigger plugin from one Jenkins server to execute a job on a remote Jenkins server using a Groovy script, the Jenkins job returns a 401 unauthorized exception.

Exception Message: "Connection to remote server failed [401], waiting for to retry - 15 seconds until next attempt."

Using the CredentialsAuth(credentialsId: '<USER_ID>') with a user that can sign into the remote server using a username and password.

Function used in Groovy script: 
'org.jenkinsci.plugins.ParameterizedRemoteTrigger.pipeline.RemoteBuildPipelineStep'()

Not sure if it is relevant but the job URL string has spaces in the job name which are encoded.