I am using IIS10 and trying the command:

appcmd set apppool /apppool.name: defaultapplicationpool /recycling.periodicRestart.time:00:30:00

And I get an answer:

APPPOOL object "defaultapplicationpool" changed

But in fact, nothing happened to the pool. The settings were not applied.

I found a solution using powershell:

Set-ItemProperty -Path IIS:\AppPools\defaultapplicationpool -Name recycling.periodicRestart.schedule -Value @{value = '00:30:00'}

But it's more convenient for me to use appcmd.

Can anyone explain why there is such a problem?