How do I reset my MacBook which are managed by an organization?

Hi,

I need to reset my Macbooks (models A2179, 2337 & 2159) which are managed by an organization (MDM control).

I bought them from a company who managed them but in their system where you can see all the macbooks and other laptops, these one's miss. They use Microsoft Intune for their company and they're not in the list.

The accounts from the imployers are still on the computers and every one of them has another account on it called "management".

I want to fully reset the macs and make new accounts on them. I don't care if any files get lost.

I saw that I may be able to use Kon-Boot but I don't know if that works with an organization managing the macs.

Are there any other softwares or options I can use to get into the macs?

Thanks!!!