If you dont know how to fix it, read this post fromMiniToolto find the methods.
This error typically occurs after applying the Windows 10 Anniversary Update (version 1607).
Here are some other reasons for the unable to reach Windows activation servers error:
1.
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Internet connection is unstable.
Activation servers are busy.
An antivirus suite or Firewall is blocking product activation.

PC is behind a proxy server or VPN web link.
PC was previously upgraded to Windows 10 from a pirated version of Windows 7, 8.1.
Next, I will introduce some useful methods to troubleshoot your problem.

How to Fix the Unable to Reach Windows Activation Servers Error?
Its important to eliminate some potential culprits right from the get-go.
First, you should see to it youre on a trusted web connection.
Then if you have set up a Proxy server or VPN online grid, you should disable them.
Step 1:PressWindowskey +Rkey to open theRunWindow.
Typecontrol updateand clickOKto openWindows Update.
Step 2:ClickCheck for up dates.
Wait for the utility to scan your system and power cycle your system when prompted.
Now, return to the Activation window and see if the issue is removed.
If not, move down to the next method.
Troubled by the issue Windows Updates cannot currently check for updates?
This post shows 4 solutions to fix Windows update failed problem.
But you should double-check your Internet connection is stable.
Step 1:Press theWindows+Rkeys to open theRunWindow.
Typesluiand clickOKto bring up the WindowsActivationClient.
Step 2:ClickChange product key, then enter the appropriate generic key for your Windows edition.
Then you might peek if the issue has been fixed.
Here are the steps:
Step 1:Press theWindowskey +Rkey to open theRunWindow.
Typeslui 4and clickOKto open theInstallation IDscreen.
Step 2:Then, select your country or region and clickNext.
Step 3:Minimize theInstallation IDwindow when you are prompted to call the number.
Then, search forget helpin theSearchbox and open theGet Helpapplication.
Step 4:Typetestand then chooseNoat every prompt until you get the option talk to a person.
Step 5:Go toServices & Apps>Windows>Setting upand chooseChat online with a Microsoft Answer Tech.
Step 6:Maximize theInstallation IDwindow and copy it into theContact Supportwindow.
The Microsoft Answer Tech will provide you with the Confirmation ID.
Then you should return to theInstallation IDwindow, clickEnter confirmation ID.
Step 7:ClickActivate Windowsand wait for the license to be reactivated.
it’s possible for you to try the above methods one by one to fix your issue.