Windows 10: Impossible to add a device in my "My Account" if you don't have Microsoft Device. Shame on...

I went in My Account / Devices and I noticed that my desktop Windows 11 is showing up twice with the same name, etc... I did delete one of the devices and by mistake I deleted the second one as well. I said, not a big deal, there is an "Add Device" button.When you click Add Device it asks for the Serial number. My PC was installed by myself from parts, and does not have a Chassis SN. I wanted to use the Motherboard SN, but this one had underscore symbol, the Microsoft doesn't accept. Then I removed the _ and used the other characters, but guess what, the answer was this:We didn't recognize t

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my device is a windows 7 device. how come I don;t see it on my microsoft account

my device is a windows 7 device. how come I don;t see it on my microsoft account

 

Unknown devices on my Microsoft account

Hello Flemmingk,

Could these other devices be from friends that you may have signed in to your Microsoft account on for something?

Either way, you can remove these devices.

*Arrow Microsoft Account - Remove Devices User Accounts Tutorials

Afterwards to be safe, I would recommend to change the password of your Microsoft account, and enable two-step verification if you haven't already.

Change Password of Account in Windows 10 User Accounts Tutorials

Turn On or Off Microsoft Account Two-step Verification User Accounts Tutorials

 

Unknown devices on my Microsoft account

Thanks Brink
I get different reactions every time I try to delete a device, but the result is that I cannot remove the devices.
I'll go back to local accounts and delete the Microsoft account.
I changed to Microsoft account because I wanted to use the Continue on PC feature. This feature doesn't work so I think that I'll just forget about it.
Thanks for your interest.