Zend certified PHP/Magento developer

how it possible to allow rdp with multiple users simultaneously on windows server 2019 without rdp role

My friend works in a company from home remotely via RDP

They are 5 employees who are simultaneously connected to windows server 2019

I checked and saw that no RDP role was installed on that server

they just created 5 users with admin privileges ( administrators group )

I know only 2 people can connect at the same time so how did they do it?

How did they allow 5 people to connect at the same time?

And they didn’t install any hacks or anything like RDP Wrapper .

RDP Wrapper even doesnt work at this version .