And now this issue is solved by Microsoft.
However, users can see this post to learn what happened in the past.
Windows 10 activation problem is one new issue.

Why is this happening?
Microsoft support has given the answer.
However, machines which shipped with the Windows 10 Pro turned to be not affected at this time.
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Find the option go back to an earlier build not available after 10 days?
Full solutions to fix Windows 10 rollback option not working are here!
However, it is not the truth.
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Thus, it asked the users to implement the Windows 10 Home to correct the issue.
But, indeed, you didnt have to do this.
Affected customers will see resolution over the next 24 hours as the solution is applied automatically.
In the meantime, they can continue to use Windows 10 Pro as usual.
Is This Issue Solved Now?
Users who were facing this issue could see that it could be resolved automatically within 24 hours.
On the other hand, users could also solve this issue by themselves.
They could just punch the Start button and then went toSettings > Update & security > Activation.
Then, they can pressTroubleshootoption to run theActivation Troubleshooter.
After that, this issue could be solved successfully, and users computer could return to normal state.
We believe that users can use their computer as usual now.
Do you want to remove Activate Windows 10 watermark from your rig?
In this post, we will show you two effective methods to do this job.