Intermitten "Failed to apply web template." when using ApplyProvisioningTemplate

Hi,

I am using a Azure Function together with a Logic App to provision new SiteCollections. Intermittenly I get:

Failed to apply web template.
Site: {url}
Template: D:\home\site\wwwroot\Files\Template\web-template.xml
Operation is not valid due to the current state of the object.

I am able to apply the template using PowerShell Apply-PnPProvisioningTemplate afterwards. What are the likely culprits?

I am checking that the sitecollection exists prior to adding the template. For the most part everything works fine, but sometimes it fails.

Pål