Add SiteProperties.DisabledWebPartIds to CSOM
Please add SiteProperties.DisabledWebPartIds to the Microsoft.Online.SharePoint.Client.Tenant library. The similar endpoint tenant.DisabledWebPartIds is available since August 2018...
Currently it is not possible to set the following setting outside of PowerShell (and therefore not possible to use application permissions):
Maybe you just forgot it? Otherwise i can't explain it to myself that this command is available in powershell for quite a long time.