How to build a Flask App and run it as a windows Service

I am facing some issue when I try to start a flask simple Hello World as a service on windows, I have tried diferent solutions, but any of them get the same windows error.

"O serviço não respondeu à requisição de início ou controle em tempo hábil". The service did not respond to the start or control request in a timely manner.

import win32serviceutil
import win32service
import win32event
import win32evtlogutil
import servicemanager
import socket
import time
import logging
import os
import sys

sys.path.append(os.path.dirname(__name__))

from myapp import app

logging.basicConfig(
    filename = r'c:\tmp\flask-service.log',
    level = logging.DEBUG, 
    format = '[flaskapp] %(levelname)-7.7s %(message)s'
)

class HelloFlaskSvc (win32serviceutil.ServiceFramework):
    _svc_name_ = "FlaskAppTest"
    _svc_display_name_ = "FlaskApp Service"

    def __init__(self, *args):
        win32serviceutil.ServiceFramework.__init__(self, *args)
        self.hWaitStop = win32event.CreateEvent(None,0,0,None)
        socket.setdefaulttimeout(5)
        self.stop_requested = False

    def SvcStop(self):
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
        win32event.SetEvent(self.hWaitStop)
        self.ReportServiceStatus(win32service.SERVICE_STOPPED)
        logging.info('Stopped service ...')
        self.stop_requested = True

    def SvcDoRun(self):
        servicemanager.LogMsg(
            servicemanager.EVENTLOG_INFORMATION_TYPE,
            servicemanager.PYS_SERVICE_STARTED,
            (self._svc_name_,'')
        )

        self.main()

    def main(self):
        app.run(host="127.0.0.1", port=8000)

if __name__ == '__main__':
    if len(sys.argv) == 1:
        servicemanager.Initialize()
        servicemanager.PrepareToHostSingle(HelloFlaskSvc)
        servicemanager.StartServiceCtrlDispatcher()
    else:
        win32serviceutil.HandleCommandLine(HelloFlaskSvc)

and this is myapp.py

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello():
    return 'Hello World!'

and this is the actual command I am using to make the executable

pyinstaller --onefile --hidden-import=win32timezone win32_service.py