Home » Fix: Activation Error 0x803FABB8 on Windows 11 After Upgrading

Fix: Activation Error 0x803FABB8 on Windows 11 After Upgrading

Are you also getting the Activation error 0x803FABB8 while upgrading to the latest Windows 11? Well, recently, on the Microsoft forum, a user David Lucas reported that he is getting this error since he tried to install the latest patch update for Windows 11.

After that, there are numerous users complaining about the same. However, in response, a tech enthusiast answered David and suggested some fixes to get rid of this error.

However, most probably not everyone uses the Microsoft community forum. That’s why we are here with a guide to explain this issue and help you fix the problem. So, don’t worry, these fixes will surely help you.

Fix: Activation Error 0x803FABB8 on Windows 11 After Upgrading

How to Fix Activation Error 0x803FABB8 on Windows 11 After Upgrading

There are various reasons behind this error, but after investigating this error, we have found some troubleshooting methods that surely help you to resolve the Activation error 0x803FABB8. So, make sure to follow them carefully.

#1 Method: Reinstall Windows 11

With Windows 11, even if you have the license key, you may get this type of error as most of the PC may still not be compatible with the version.

Most of the time, just because we have the license key to activate the Windows 11 professional or pro version and you are trying to activate it in the Home version, your PC shows an activation fail error.

Then, you have only one option, i.e., first, install the compatible version of Windows 11 and then use the key to activate it. In case you don’t know how to clean install the new version of Windows 11, follow the given link.

#2 Method: Use The Activation Troubleshooter

Windows Activation Troubleshooter is a tool that will help you keep your Windows activated or reactivate your Windows, but only if you’re running Windows 10, version 1607 or later.

However, you are able to use this only if you are logged in using your admin account. Meanwhile, if you are still not done this, follow the instruction given below:

  1. Firstly, open the Windows 11 Settings app using the Win+I button.
  2. Next, switch to the System. If you didn’t see the System’s tab, click on the three-vertical line to expand it and select the System tab.
  3. After that, click on Activation from the opened list of available options.Windows 11 Activation Window
  4. Then, click on the Troubleshoot on the next page.
  5. Now, you need to wait for a while until the utility scans your PC and then hit the Apply this fix.Apply this fix in Windows 11
  6. That’s it. Once it gets fixed and reboots your PC.

Also Read: What is Nahimic Companion, Is It a Virus And How To Get Rid of It in Windows 11?

#3 Method: Contact Microsoft

If the above two methods don’t work in your case, you can go to the Microsoft Support page and contact them and ask for help. If you really have a genuine issue, then it might be possible for Microsoft to assign an engineer to help you remotely.

There is also a toll-free number available, depending on your region. This will surely help you fix this Activation error 0x803FABB8. Additionally, you also follow the link to get the toll-free phone number associated with the region.

Microsoft Windows 11 Toll free number


Generally, this kind of problem occurs due to our own fault and Microsoft have nothing to do with this. But, no worry because now you know how to fix it permanently.

Nevertheless, if this is the issue that occurred from the developer’s end, you can wait as the Microsoft developer team is very cautious about the user’s experience. So, they will soon roll out some fixes to resolve the Activation 0x803FABB8 error. Anyway, guys, we hope this guide helped you. But, if even after this you have any doubts in your mind, feel free to ask us in the comment section.


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