MSDeploy ERROR_SITE_DOES_NOT_EXIST does not fail Jenkins job

Question

We have a Jenkins Pipeline job setup to use MSDeploy to deploy to our dev environment. We have a groovy file checked into source control that runs the deployment of several different applications. Each application then downloads and calls this file. When MSDeploy encounters an error such as Error Code: ERROR_USER_NOT_ADMIN, the job fails as expected. If someone fat fingers the "IIS Web Application Name" in the SetParameters.xml file, you can see the error in the Jenkins Logs

15:55:36 Error Code: ERROR_SITE_DOES_NOT_EXIST
15:55:36 More Information: Site 'dev.mysite.com1' does not exist.  Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_SITE_DOES_NOT_EXIST.
15:55:36 Error count: 1.
[Pipeline] }
[Pipeline] // withCredentials
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // timestamps
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS

but the job still exists as successful.

Excerpt from Pipeline Job Groovy:

Stages = load "DeployTo_Test.Groovy"
Stages.Deploy(DROP_FOLDER, PROJECT_NAME, VER_DEPLOY_TO)

Excerpt from DeployTo_Test.Groovy

def Deploy(DROP_FOLDER, PROJECT_NAME, VER_DEPLOYMENT_LOCATION) {
    ...SetSomeValues
    bat "pushd  ${COMMAND_LOC_TO_RUN}  && ${PROJECT_NAME}.deploy.cmd /Y /M:${deploymentMachines[i]} /U:%DeployUsername% /P:%DeployPassword% -setParamFile:%workspace%\\${SetParamFile}"
}

Logs from a different MSDeploy error that fails the job

16:16:48 Error Code: ERROR_USER_NOT_ADMIN
16:16:48 More Information: Connected to 'myMachine.com' using the Web Deployment Agent Service, but could not authorize. Make sure you are an administrator on 'myMachine.com'.  Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_USER_NOT_ADMIN.
16:16:48 Error: The remote server returned an error: (401) Unauthorized.
16:16:48 Error count: 1.
[Pipeline] }
[Pipeline] // withCredentials
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // timestamps
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
ERROR: script returned exit code -1
Finished: FAILURE

Why does Jenkins\\MSDeloy bat command exit successful with ERROR_SITE_DOES_NOT_EXIST and how do I get it to fail on this error like it does on the other?