Invoke-PnPSiteTemplate - Invalid field name. {...} https://....sharepoint.com/sites/...

[BlazeOfFeathers]

Hello everyone,

Every time I want to apply a template I get the following error:
Invalid field name. {c5c92213-f0c6-4a49-8477-83a1d693b421} https://.sharepoint.com/sites/

This is the code I use to retrieve and invoke the template:

       $templateConnection = Connect-PnPOnline -Url $template.FieldValues.SiteLink.Url -ClientId $clientId -Tenant $tenantId -Thumbprint $thumbprint -ReturnConnection -ErrorAction Stop
        Write-Verbose "Connected to template: $($templateConnection.Url)" -verbose
        $templateInstance = Get-PnPSiteTemplate -Connection $templateConnection -OutputInstance -Schema V201503 -Handlers Fields, ContentTypes, Files, Lists, PageContents, Navigation -ErrorAction Stop  
        Write-Verbose "Template loaded" -verbose
        $webConnection = Connect-PnPOnline -Url $supplier.FieldValues.SiteLink.Url -ClientId $clientId -Tenant $tenantId -Thumbprint $thumbprint -ReturnConnection -ErrorAction Stop
        Write-Verbose "Connected to supplier site: $($webConnection.Url)" -verbose           
        Invoke-PnPSiteTemplate -Connection $webConnection -InputInstance $templateInstance -ClearNavigation -ErrorAction Stop
        Write-Verbose "Template invoked" -verbose

I'm running this on a Azure Automation with PnP.PowerShell version 1.4.0

Would be thankful for any hints on this case!

Kind regards,
Nicolas