I found this in the user certificate settings on my phone (Samsung Galaxy A12, Verizon)
Is it safe? Is it required by the system to work? What is it?
Also found this on my Samsung Galaxy S21+. Hoping someone might be able to help us! 
Wondered the same thing. I found this on Samsung regarding its Knox security:
Enhanced Attestation uses the Samsung Attestation Key (SAK) to prove: 1. The key is protected by a secure hardware. 2. The device is manufactured by Samsung. 3. The device ID isn’t comprised.
It’s a Samsung security certificate, appears to be legit and nothing to be concerned with.
Did you work out what this was in the end? I have it too?
Found this on my samsung galazy A42 and it wasnt there a few months ago