Chapter in this post:
I had the following problem with my MacBook after creating user accounts for my children on it. I'm actually used to creating a user in the system settings under macOS / OS X and these are then visible as an account after the restart and can log in directly.
Unfortunately it was different in this case: Instead of the 4 accounts created for my children, a test account and me, only the two accounts for the tests and me were visible. My children's accounts could only be accessed by changing users if I was already logged in myself.
After taking the detour via switching users for a few weeks, I got tired of it and did some research to find out what it was now. The solution is ultimately quite plausible and simple (found on an Apple support site via FileVault): While the test account and my account were allowed to unlock the hard disk encryption through FileVault, this was not activated for my children. As a result, they did not appear at the time of registration, because they would not be able to use the MacBook without unlocking it.
In order to make the two missing users visible when the system is started, so that they can log in straight away, you just have to go to the system settings, click on the icon for "Security" and then select the "FileVault" tab. Now click on the lock at the bottom left and enter your admin password so that the "Activate user" button is no longer grayed out and can be clicked.
If you click this button, a window appears with the other users who can be activated for FileVault unlocking. If you restart the Mac, all activated users should be represented by their names on the start screen.
Here are the steps again with matching screenshots:
[sc name = "macOS manual"]
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.