For an on-premise installation, if you need to create a new subsite under an existing subsite (such as a new subsite under the Finance Department subsite), then there are commands that must be executed prior to ensure SharePoint has the right resources assigned to complete the operation.
- Open the SharePoint 2016 Management Shell command window (you MUST have administrator permissions)
- In the command window, execute the following commandlets:
$wa.ClientCallableSettings.MaxResourcesPerRequest = 50
Where * is the ROOT URL for your SharePoint installation (example: https://akdevco.com)