@Jad Covington, Thanks for posting in Q&A. From your description, it semms there are 3 device enrolled via Autopilot enrollment method.And the devcies have some odd issues.
One issue is that, after the three users login each other's computer.on the login screen, the display name only show the other two users. If there's any misunderstanding, please get screen shots to let us better understand the issue.
On my enrolled device, when login with many users I find only the last sign in user account and "other user" appear on the login screen.
It seems you want to show multiple accounts on logon screen. Based on my researching, you can try the method in the following link to see if it works.
I have also tested in my environment, here is the Setting Catalog policy I configure which can show the signed user account on logon screen. You can refer to it:
Hope the above information can help.
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