The document is not generated
Generating invoices manually does not work
If you click the Issue invoice button in WooCommerce order and nothing happens - the invoice is not generated: you should start with increasing your server's memory limit to a higher value. If this doesn't help, please check your debug.log file for any PHP errors.
Automatic invoices are not being generated
If you have enabled the automated issuing of the documents, you have chosen a certain order status. If the invoices are not being generated automatically, please make sure that your order's status matches the status from the plugin settings.