Win10 preview can not be activated how to do

Microsoft has pushed three Win10 preview updates to Windows Insider users. During this period, many users have encountered activation problems, mainly in users who use Windows 10 Preview 10159 and 10162 versions.

Now, the official staff from the Microsoft Q&A community said that the company is currently testing the Win10 activation service. In the next few days, some users will encounter problems that cannot be activated. Don't worry, ignore this issue for a while, and wait until Microsoft re-enables the activation service, the system will automatically try to activate.
Here is a reminder of new friends who have installed Win10 Preview 10158, 10159 and 10162. Different from previous versions, the activation keys of these versions have changed. Users need to enter the keys themselves during installation or after installation. To activate, please refer to "Win10 Preview 10162 New Installation and Activation Full Process Diagram".