I'm not sure what kind of authority you have or in which jurisdiction you are to be able to say with such confidence that you need "just a doctor's note", but I was speaking from personal experience where a doctor's note was rejected as it wasn't specific enough to warrant an exception to the RTO mandate. And the doctor is not allowed to put the exact diagnosis in writing for the company. So currently it's a stale mate while everyone is trying to find an acceptable formula for what said doctor's note should say to satisfy the (in)human resources drones and their capitalist overlords.