Scheduled event flows (SEF's) never run in a user context so it wil never show a message. SEF’s can change objects etc but if you want to show something to a user you I would set a microflow timer widget on the homepage or higher on the layout that runs a microflow and do your stuff. You then have a user context and then you can show text to a user.
You can use the Scheduled Event resource for creating a scheduler. Do the configuration as given below:
You need to set server radio button instead of UTC..If u select UTC means It will reflect on cloud side.Server is used to trigger microflow from our local.So u should select option as Server.
Hope it will work.