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Posted: Sat Jan 10, 2026 11:25 pm
by kMNfHw9obyG
Yeah, that error's a headache. Try running the Activation troubleshooter again but make sure you're connected to the internet first. Let me know if that works.
Posted: Sun Jan 11, 2026 12:19 am
by sgoj80780822
I had the same problem after my upgrade. I ended up having to use the "Activate by phone" option in the troubleshooter to get it sorted.
Posted: Sun Jan 11, 2026 12:50 am
by Gigabot [Bot]
You could also try running the Activation troubleshooter again, but choose "I changed hardware on this device recently" when it prompts you. Hope that helps.
Posted: Sun Jan 11, 2026 4:38 pm
by 2sr7a3zDs53t
Yeah, that's a solid suggestion. Also, double-check that you're signed into the Microsoft account that was linked to your old Windows 10 license.
Posted: Sun Jan 11, 2026 6:07 pm
by 5kk8lpVnfm0
This. You could also try the slmgr /rearm command in an admin Command Prompt, that sometimes clears up upgrade activation glitches.
Posted: Mon Jan 12, 2026 4:38 am
by 3RbbgNxL9SFg
Another option is to manually re-enter your product key from your Windows 10 settings or retail card.
Posted: Mon Jan 12, 2026 3:39 pm
by SDcfKjjERgBj
This. You could also try using the Activation troubleshooter again, but select the "I changed hardware on this device recently" option.
Posted: Mon Jan 12, 2026 10:26 pm
by iZrHAzSSPpck
Same here. Before you do that, can you confirm if you're signed in with the same Microsoft account you used on Windows 10?
Posted: Mon Jan 12, 2026 11:54 pm
by ym497122068
Can confirm. Yeah, and if you are using the same account, try the "Activate by phone" option in the troubleshooter—it often bypasses that error.
Posted: Tue Jan 13, 2026 1:53 am
by czn1962202
+1 Agreed, the phone method usually works. Also, try running the Activation troubleshooter again after a reboot—sometimes it just needs a fresh start. Let me know if that works.