Your activation is OEM SLP, OEM SLP is a kind only used for preinstallations with laptops.
The way it works is by activation through the BIOS, the BIOS holds a SLIC table that holds the activation details what makes it possible to install Windows on preinstalled laptops without activation problems.
As the OEM SLP activation is preinstalled in the BIOS by the manufacturer it is bound to 1 motherboard only and cannot be used on any other motherboard regarding if it is the same manufacturer.
The OEM SLP is from Dell and the retail motherboad is Gigabyte, an OEM SLP cannot be activated legally on a retail motherboard and that is why your installation is counterfeit.
Just filling in a OEM SLP product key is not possible, certain things have to be modified in order to use the product key and these modifiations can cause many problems explained above.
The only way to get rid of these modifications is by formatting the hard drive and clean installing Windows again using a genuine activation.
Besides of this all we also do not provide support for piracy per the
Forum Rules so the only option currently to receive support is by performing a format (after backing up your data) and clean install with a genuine activation.
All reputable forums do not support piracy in literally any way someone could think of so going to a different forum to ask for help won't be an option.