Activation issue with Windows 11

[Windows 11]

After about 7-9 months of building a PC and setting it up with a fully paid and registered windows OEM, I get this error message: "Windows reported that no product key was found on your device. Error code 0xC004F213".Logging into "Microsoft Account > Devices" I can view my multiple devices. I observe my other devices have a serial number, this device has "Default String" as it's serial number.I've tried changing the product key (entering the current product key), which then yields another issue - unable to connect to the internet (yes I am on the internet) error code (0x80070057).

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