In order to send messages automatically you need to setup a Personal Automation task that runs the Scheduled Automation Shortcut. Follow these steps after you've installed the Scheduled app and the Scheduled Automation Shortcut.

Have you gone through all of these steps? Yeah! Then you're ready for this:

Step 1: Open the Shortcuts iOS app -> "Create Personal Automation".

Step 2: Select “Time of Day”

NOTE: Change the date/time at “Time of Day” to configure the date/time you would like to send your messages. So for instance, at 8AM every day.

Step 3: Select "New Blank Automation"

Step 4: Select “Add Action” and search for the "Shortcut" iOS app.

Step 5: Search & Select “Run Shortcut”

Step 6: Click on 'Shortcut' (in light blue). A sheet opens with a couple of choices. Choose: “Scheduled Automation”

Step 7: Disable “Ask Before Running”.

!!This step is very important! Otherwise Scheduled will not send the messages automatically. Instead, you will get a push notification with a consent to run the shortcut!!

Step 8: Schedule your first automated message. When you've scheduled a message and it runs for the first time, then the Shortcut app will ask to accept Privacy permissions. Please select "Always Allow", other wise it will ask you every time you schedule a message.

NOTE: Accepting the privacy settings should only need to be done once, but it should be done per send service. So one time for iMessage, one time for WhatsApp, One time for Telegram, etc.

Sometime there is a bug in iOS where your Personal Automation doesn't run. Please check this article when this is the case: My Personal Automation doesn't run

You can find Step 1 till 5 in the video below: