当使用sshagent Package 器时，我能够将ssh插入服务器A和服务器B，但是当使用scp命令时，我的权限被拒绝

pipeline {
    agent {
        label 'pipeline'
    }
    
    stages {
        stage('SSH to remote host') {

            steps {
                sshagent(credentials: ['myCredentials']) {
                    sh '''
                        ssh userBar@server.a hostname -f
                        ssh userBar@server.a ls -l
                        
                        ssh userFoo@server.b hostname -f
                        ssh userFoo@server.b "echo 'hello world' >> thisFile.txt && ls -l"

                        scp userFoo@server.b:~/thisFile.txt  userBar@server.a:~/thisFile.txt 
                     
                    '''
                }
            }
        }
    }
}

在运行时，ssh命令按预期返回，但scp命令会抛出以下内容

+ scp 'userFoo@server.b:~/thisFile.txt'  'userBar@server.a:~/thisFile.txt'
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).