Add-PnPOffice365GroupToSite << Alternatives using App-Only authentication

[lrarbin]

Hello,
I'm trying to automate the creation of M365 Groups BUT allowing different default languages to be used. By default a new M365 group will use the default Tenant Language for the Default Language for the SPO Site in the M365 Group. This means so messages etc. can be in the wrong language.

I found a solution to this by: Creating the SPO Site in the correct Locale, then Groupifying the SPO Site, this can be done with the Add-PnPOffice365GroupToSite cmdlet.

To automate this I'm running the process in Azure Automation using Managed Identities. The problem is that the underlying API uses Delegated Permissions which isn't supported with App-Only authentication. I don't seem to be able to sign into PowerShell.PnP using Credentials in Azure Automation.

Does anyone have any ideas of how to get this working? I've tried looking at the Microsoft.Online.SharePoint.PowerShell module (New-SPOSiteGroup), but I can't get this to work with Azure Automation at all. I've also consider trying to use Graph API and the SharePoint API, but I don't seem to be able to get that working either.

Thanks