Pre-set zoom meeting link - with fixed name - unchangeable

I was once invited to a Zoom meeting or webinar session (perhaps a webinar) hosted by a government office. 

Prior to attending the zoom session, the participants must register first.  After that, the host sent us a zoom link that directs the participant into the zoom session (no manually input user ID nor passcode).

During the zoom session, the name of all participants is locked (unchangeable) with the pre-assigned name / determined by the host.

I wonder to know whether such functionality is available on zoom meetings and how to pre-set the assigned name of the participants.

This is important when we have a zoom session and the participants have not registered nor log in hence the name of their device is shown as their ID or name.

Thanks for your sharing.