Steady meeting room for Zoom office hours, ready at any time
This semester, I was able to join my office hours for a scheduled meeting at any time, even outside the window of the scheduled meeting.
Zoom has a checkbox “Allow participants to join anytime” that may be selected when creating the scheduled meetings. You will get an email notification if someone joins when you are not there. This allows students to join at any time.
Because the meeting ID does not change, this satisfies your link request.
Disclaimer: I do not know if I have a special version of Zoom; whatever the university provides is what I have.