Local security setting will not persist: Administrator account status

I'm trying to disable the local admin on my workstation. I load local group policy editor and navigate to Computer Config -> Windows Settings -> Security settings -> Local Policies -> Security options, and I disable the Accounts: Administrator account status. I then exit the editor and reload it but the setting has returned to enabled.

This PC is connected to Azure ActiveDirectory. I can't see any errors in the Event Viewer.

My goal is to stop the local admin account logging in automatically when Windows starts up, which is what it's doing currently.