@디엔소프트 DNSOFT Thank you for providing the screenshots.
As the warning says, having a duration of less than 5 minutes can cause what is called flapping, which can cause rapid scaling up/in or no scaling at all. Can you please try setting the duration to 5 minutes or more and observe what happens? We believe this should resolve the error.
More info on flapping here: https://learn.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-best-practices#choose-the-thresholds-carefully-for-all-metric-types
Please share with us the outcome of the higher duration setting.