We have 5 CAS S400-A4 appliances on 3.1.0.1 version. We have been trying to create a base image with different Windows 10 iso (1909, 1903) through "upload from local file" option and licensing with internal KMS but it´s been constantly failing almost all the times (we tried like 10 attempts through the different appliances) but a single attempt on which it got to create successfully. The weird thing is that the failure occurs at random stages of the import procedure, so it makes it harder to find a pattern or identify the issue. Some of the different error messages are of "Activation failed", "Recovery: Your PC device needs to be repaired". I am attaching some screenshots. We also tried licensing with specific keys but it still fails at random points. We are working with support but so far we can´t find the cause of this behavior. We shared one of the Windows ISO files we used with support and they tested it successfully. Has anyone gone through a similar behavior? Also, it´s not clear whether only Enteprise licenses should work, or Pro editions as well? Could you please share which windows 10 version and license type worked for you successfully? With KMS or product key? We are thinking of doing a factory reset on any of the CAS appliance to see if it makes any difference. Any other suggestion is appreciated.