Azure Automation Runbooks using Powershell: Push notifications error?

I'm trying to run some PnP PowerShell commands in an Azure Runbook (e.g. Get-PnPContentType, Apply-PnPProvisioningTemplate, etc. ) over a SharePoint site, but it keeps returning the error below:

The Push Notifications feature is not activated on the site

The correct modules have been imported and it only errors on some commands. Running the commands in a PowerShell window with the same credentials doesn't produce any errors, and activating the 'Push Notifications' feature manually and retriggering the Runbook won't produce any error output, but will say that the Runbook failed to run 3 times.