Multiple Users: Can't setup pin for second user. (Samsung Galaxy S8)

Hi guys,
i set up a second user to use it for work. When created i cant change the Screen Lock to Pin or Fingerprint, Password or anything in the settings. It says “The Lock Screen was already changed”.
Like this it is very unsafe to use multiple users. Is this known? Would really like to use a safe Lock Screen on my work-user.

P.S. thanks for the great work! I’am using e/os on all my android-devices.

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