I got a security popup today saying my Windows is inactive and needs activation. I've had this PC since 3/11/24 and this is the first time I've had this pop up. I did a little research online and tried a few things. I tried running the Recovery in Windows updates but no dice. I saw another post where someone asked for a command prompt output of slmgr /dlv which I ran, but I have no idea what any of it means.

I tried running the slmgr.vbs /ato is mentions, but it says it cannot find Key Management Software. I downloaded ShowKeyPlus that someone else mentioned, and it says my Key is a default key and requires a digital license for activation. It also says the OEM key is not present in the firmware.
I'm not sure if all this happened because of a recent Windows update, or what caused the activation to suddenly vanish. I saw someone else mentioned contacting microsoft chat support, but all I seem to find is an endless sea of self help documents and never an actual way to contact chat support. Any guidance from here is appreciated!
Edit : I bought this PC off Newegg. I've been doing some more digging and I see now that the GVLK most likely means it requires a Key Management Server that it checks with every 180 days, and that these types of Key Channels are usually found within large business/enterprises. Should I contact the vendor and complain about the key channel and attempt to get a valid key that doesn't require a KMS? I assume the chances of them responding with one are slim. Or is contacting Microsoft the best option? I've seen some post that say Microsoft will give you a valid key if you have proof of purchase for the device, which I do have.