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If the Lightroom version is lesser than CC 2015.5 , then the signing in to Lightroom mobile does not work.
You would need to upgrade Lightroom for it to work. Latest available version is CC 2015.10.1
I'm afraid it's not an answer to my issue since all my adobe apps are up to date - I've installed them all yesterday. I've seen that not only my station has this issue. I tried to configure another windows user account and its still not working. Please guide me through any next step. I've bought this adobe photo subscription in this specifical purpose - being able to work on my files on PC and iPad pro both then this feature is kind of key one for me.
For now - everytime I press "Sign in" - nothing happens. I can go to preferences and lightroom mobile tab and only option i have there is "join" and it sends me to your main commercial webpage.. Its annoying. Moreover in the log below there is a Windows 8.1 stated and it's even more confusing since I have Windows 10 in my system info.
Looking forward to any solution.
Lightroom version: CC 2015 
License: Creative Cloud
Operating system: Windows 8.1 Home Premium Edition
Version: 6.3 
Application architecture: x64
System architecture: x64
Logical processor count: 4
Processor speed: 2,3 GHz
Built-in memory: 8094,4 MB
Real memory available to Lightroom: 8094,4 MB
Real memory used by Lightroom: 291,5 MB (3,6%)
Virtual memory used by Lightroom: 251,6 MB
Memory cache size: 0,0 MB
Maximum thread count used by Camera Raw: 2
Camera Raw SIMD optimization: SSE2,AVX,AVX2
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 2560x1440
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Graphics Processor Info:
GeForce GTX 950M/PCIe/SSE2
Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 3.3.0 NVIDIA 378.92
Renderer: GeForce GTX 950M/PCIe/SSE2
LanguageVersion: 3.30 NVIDIA via Cg compiler
Application folder: C:\Program Files\Adobe\Adobe Lightroom
Library Path: C:\Users\F\Pictures\Lightroom\Lightroom Catalog.lrcat
Settings Folder: C:\Users\F\AppData\Roaming\Adobe\Lightroom
2) Canon Tether Plugin
5) Leica Tether Plugin
6) Nikon Tether Plugin
Config.lua flags: None
Adapter #1: Vendor : 10de
Device : 139a
Subsystem : 1acd1043
Revision : a2
Video Memory : 4065
Adapter #2: Vendor : 8086
Device : 1616
Subsystem : 1acd1043
Revision : 9
Video Memory : 80
Adapter #3: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceName: Speakers (Realtek High Definition Audio)
GPUDevice: not available
Do you have Lightroom installed on your desktop PC?
P.S. update to version LR CC 2015.10.1 you have the initial version of Lightroom CC installed version 2015.0 installed.
Of course I have all of this topic subject is about a desktop one
It keeps saying in the Creative Cloud that I'm up to date. Is it possible to download specific (the latest one) version?
The link I posted earlier has the update link for LR CC 2015.10.1 download and run the installer it will update the version you have installed. You do not have to uninstall the version presently installed. (the update is a patch not the complete application)
This is what I had suspected. Based on your information, you are using Lightroom CC 2015
However, sync works only from versions CC 2015.5 and above.
You would need to upgrade the Lightroom version.
I will contact the customer support team, and they would be able to help you out on updating the version.
It's resolved by your remote support. Case closed. Thank you.
That's great !!