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AdvancedSchedule generates error when using monthDays for new schedule

If I want to deploy a monthly schedule on for example the last day of the month I encounter an error message when I used the REST API or the ARM template.

The body of the REST API for creating schedules I used look likes this:

{
  "name": "demoSchedule",
  "properties": {
    "startTime": "2022-05-07T22:00:00+02:00",
    "interval": 1,
    "frequency": "Month",
    "advancedSchedule": {
      "weekDays": [],
      "monthDays": [ -1 ],
      "monthlyOccurrences": []
    }
  }
}

When I execute this REST call I receive the following error message:

{
  "code": "BadRequest",
  "message": "Argument requestScheduleData with value Orchestrator.Schedules.DataAccess.Models.ScheduleAllData is not valid. Error message: The input    value is not valid for Monthly Schedule Type"
}

After spending a lot of time of trial & error I learned that when I update an existing schedule the action can be completed successfully. So if I first post the following body to the REST API the schedule will be created successfully.

{
  "name": "demoSchedule",
  "properties": {
    "startTime": "2022-05-07T22:00:00+02:00",
    "interval": 1,
    "frequency": "Week",
    "advancedSchedule": {
      "weekDays": [
        "Friday"
      ],
      "monthDays": [],
      "monthlyOccurrences": []
    }
  }
}

In the second step I will sent the body of the call that fails and the schedule will be updated successfully. I tested apiVersion 2015-10-31 and 2020-01-13-preview and both will fail if you want to create the new schedule with one call.

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