Unable to activate Unity free in batchmode

Hello,

I've opened a forum post a few days ago about an Issue I'm having with Unity free license activation in batchmode. I'll copy the post content here and leave a link in case someone wants to contribute there. Also, whenever I get an answer I'll update this question: https://forum.unity.com/threads/activating-unity-free-in-batchmode.533021/

I have an issue when activating Unity free license through batch mode in Windows.

I'm using a CI system running Windows (AppVeyor) that installs Unity and tries to build my software on a fresh machine.

However, after Unity is installed any command line interaction gets stuck in the license check, even if I provide my credentials to the command with the -username and -password flags.

This is not an issue in other CI systems based on Mac Os (such as Travis) as the Mac version of the editor doesn't require the license in batch mode.

Any clues on how to solve this?

Thanks ahead!

Logs of the activation:

 BatchMode: Unity has not been activated with a valid License. Could be a new activation or renewal...
 
 (Filename: C:/buildslave/unity/build/Editor/Platform/Windows/WinEditorMain.cpp Line: 805)
 DisplayProgressbar: Unity license
 User ***** logged in successfully
 LICENSE SYSTEM [2018520 7:56:4] Starting license activation with account *****
 LICENSE SYSTEM [2018520 7:56:4] Opening https://license.unity3d.com/update/poll?cmd=9&tx_id=f75aedb9b9ab8444db4324d026a1f6d3
 LICENSE SYSTEM [2018520 7:56:4] Posting <?xml version="1.0" encoding="UTF-8"?><root><SystemInfo><IsoCode>en</IsoCode><UserName>appveyor</UserName><OperatingSystem>Windows 8.1 (6.3.0) 64bit</OperatingSystem><OperatingSystemNumeric>630</OperatingSystemNumeric><ProcessorType>Intel(R) Xeon(R) CPU E5-2697 v3 @ 2.60GHz</ProcessorType><ProcessorSpeed>2600</ProcessorSpeed><ProcessorCount>2</ProcessorCount><ProcessorCores>2</ProcessorCores><PhysicalMemoryMB>1535</PhysicalMemoryMB><ComputerName>APPVYR-WIN</ComputerName><ComputerModel>Virtual Machine (Microsoft Corporation)</ComputerModel><UnityVersion>2017.4.3f1</UnityVersion><SupportedLicenseVersion>6.x</SupportedLicenseVersion></SystemInfo><License id="Terms"><MachineID Value="Lm/o/LytXd2z54ij661pSVaJ1/o=" /><MachineBindings><Binding Key="1" Value="00254-20000-00000-AA643" /><Binding Key="4" Value="NDE4NC03ODU4LTI2NTAtNjMwNS00Nzc0LTY0NTgtNzQ=" /></MachineBindings><UnityVersion Value="2017.4.3f1" /></License></root>
 LICENSE SYSTEM [2018520 7:56:6] Received https://license.unity3d.com/update/poll?cmd=9&tx_id=f75aedb9b9ab8444db4324d026a1f6d3
 LICENSE SYSTEM [2018520 7:56:6] Headers:
 HTTP/1.1 200 OK
 Server: nginx/1.2.1
 Date: Sun, 20 May 2018 07:56:05 GMT
 Status: 200 OK
 X-Frame-Options: SAMEORIGIN
 X-XSS-Protection: 1; mode=block
 X-Content-Type-Options: nosniff
 ETag: W/"e35360cd0acd9add7589eabea2526588"
 Cache-Control: max-age=0, private, must-revalidate
 Set-Cookie: _activation_session=Rm9iTmJMdEh1TVhWVVFpRGppUno1TEQ5Z1RYVmgwa2lrUXVYQTRpaTRaYU83UUhKL05xYjhjbzVaMVNDOWFUbzdRUDZOTTRiRUx4ckdSajE2TFlNN0JOVTgvaWVtcmtnWlVoQWRpR3VkNG1kMElKL2hWOHYzVGx3Tk1UbzVIOFhzNmNaV2lUTGhiVUVBUXJxamQxRE9nPT0tLVdiamlHVkxwWHBDMTAybkJGYU9lQnc9PQ%3D%3D--aacff72d725e44235789cfe6318f0dc70f84f0c7; path=/; secure; HttpOnly
 Set-Cookie: SERVERID=varnish01; path=/
 X-Request-Id: 991d4c38-3226-47c3-b396-f0a876c76789
 X-Runtime: 0.467767
 Accept-Ranges: bytes
 X-Varnish: 1727163858
 Age: 0
 Via: 1.1 varnish
 sc-request-id: 1c0e628c-7cae-4447-bfb3-fca78a6b4988
 Vary: Accept-Encoding
 sc-token-expires-in: 3598
 Content-Type: application/xml; charset=utf-8
 Content-Length: 121
 
 Cancelling DisplayDialog: Updating license failed Failed to update license within 60 seconds. Exiting.
 This should not be called in batch mode.
 
 (Filename: C:\buildslave\unity\build\Editor/Platform/Windows/EditorUtility.cpp Line: 1137)