Customization Wizard - Licenses validation error

Hi Support Community,

We are tryin to create a *.mst file using the customization Wizard we following the steps correctly.

We have two scenarios

1. Network company: 

11/17/20 11:27:44:838 | [INFO] | | | | OOBELib | | | 6452 | HTTPCommunicationAgent::processMessage is https://lm.licenses.adobe.com/aes/aes/v1/serialInfo (extURL=)
11/17/20 11:27:44:840 | [INFO] | | | | OOBELib | | | 6452 | Using proxy server.
11/17/20 11:27:45:046 | [ERROR] | | | | OOBELib | | | 14328 | HTTP Request Status code:407. The proxy requires authentication.
11/17/20 11:27:45:047 | [INFO] | | | | OOBELib | | | 6452 | HTTPCommunicationAgent- Return Code:[190] response size-[0] time taken-[209.13]ms.
11/17/20 11:27:45:048 | [INFO] | | | | OOBELib | | | 6452 | Validate Serial status-[446] took-[222.30]ms.
11/17/20 11:27:45:048 | [INFO] | | | | OOBELib | | | 6452 | IALClient IAL_SetCaller-[0] took-[0.00]ms.
11/17/20 11:27:45:048 | [ERROR] | | | | OOBELib | | | 6452 | OOBELib IAL Communication Error HTTP Proxy Auth Request
11/17/20 11:27:45:048 | [ERROR] | | | | OOBELib | | | 6452 | OOBELib IAL ValidateSerial call has failed : 446
11/17/20 11:27:45:048 | [ERROR] | | | | OOBELib | | | 6452 | Using Driver/ALL combination for offline/invalid SNs scenario
11/17/20 11:27:45:048 | [ERROR] | | | | OOBELib | | | 6452 | SN validated for AAMEE mode
11/17/20 11:27:45:049 | [INFO] | | | | OOBELib | | | 6452 | OOBELib stat = 257
11/17/20 11:27:45:796 | [ERROR] | | | | Adobe PRTK | | | 11852 | Failed to validate the serial number

11/17/20 11:27:45:806 | [INFO] | | | | Adobe PRTK | | | 11852 | Return code 14
11/17/20 11:27:45:806 | [INFO] | | | | Adobe PRTK | | | 11852 | *** Adobe PRTK tool END ***

We know that we need to open the URL: https://lm.licenses.adobe.com/aes/aes/v1/serialInfo in the firewall.

2. Network outside company(internet no firewall): no error

Then, we need to know if we can use the *.mst file get in network out of comany, to deploy the unattended installation in the internal network of company to 500 users.

The unattended installation will require internet connection everytime that one user installation is done or only once time when the *.mst file is created with the customization wizard?

Thanks in advaced.

Regards.