Windows 10 Home won't activate after clean reinstallation. Error 0x8007232B "DNS name does not exist"

I bought my laptop last summer, and it came with Windows 8.1. I did an upgrade to Windows 10 Home edition today with the ISO using the media creation tool, and it was activated.

I then did a clean install just to wipe everything clean because it's been a while. Afterwards, it was activated for a couple of hours, but now it's saying that it's not activated anymore. When I try to activate it, I always get Error code: 0x8007232B. Error Description: DNS name does not exist

I'm posting from the laptop so Internet works

Update: I plugged the laptop directly into the modem via Ethernet, and the error changed to Error code: 0x8007007B. Error description: The filename, directory name, or volume label syntax is incorrect...

Ended up just doing a clean reinstall because I found out I installed Windows in BIOS mode instead of UEFI. Fixed everything, but I still don't know what caused it to begin with...