when I try to open the jenkins UI issue not loading completely

^{:JENKINS
start aws ssm start-session --target "%INTANCE_ID_RDP%" --document-name AWS-StartPortForwardingSession --parameters "portNumber"=["8080"],"localPortNumber"=["%LOCAL_JENKINS_PORT%"]
call :WAIT 9
start http://localhost:%LOCAL_JENKINS_PORT%
if %2x==agentx GOTO JENKINS_AGENT
GOTO END}