Hardware ID not generating

Hello all,

I've come across an issue where, I believe, the clients are not generating hardware IDs. I discovered this after trying to troubleshoot several machines that are not communicating with the SEPM. I directly looked at the data in the embedded database and exported the contents out to a worksheet. When I did anaylsis of each machine that are not communicating with the SEPM, all of these devices shared one thing in common, no hardware IDs.

Does anyone have any insight on this particular issue? I've tried following all knowledge articles about client-server communications (except the reinstalling method) and no luck.

Thank you in advance!