Set-PnPListPermission with App Only Unauthorized

[Ofer-Gal]

I set up an app registration with all the SharePoint permissions with admin consent.
I connect successfully with:
$siteConn = Connect-PnPOnline -Url $siteURL -ClientId $ClientId -CertificatePath $certPath -CertificatePassword $CertPass -Tenant $tenant -ReturnConnection

Then I issue:
Set-PnPListPermission -Identity 'DPCDocuments' -Group '1234.567 Owners' -RemoveRole 'Full Control' -Connection $siteConn
To remove the SharePoint group '1234.567 Owners' from the DPCDocuments library.
and I get an error:
The remote server returned an error: (401) Unauthorized.

What am I missing? Graph API permissions? which?

Thank you

[Ofer-Gal]

Never mind, Azure was just slow giving the permissions. Now it works