Bdjsndnfkff looks like the sandboxing between users is not really working,
At present, each Android device has one version installed of each app, no matter how many profiles that app is installed in. And when any profile tries to install any version an existing app the author signatures must match.
Bdjsndnfkff I created a totally fresh user and tried to install Aurora store through Fdroid.
I got the following error:
INSTALL_FAILED_UPDATE_INCOMPATIBLE: Existing package com.aurora.store signatures do not match newer version; ignoring!
This indicates that com.aurora.store was installed at some point in the past (in some profile) and now there is an attempt to install com.aurora.store but the new APK is not signed by the same certificate as the old APK. It does not indicate that sandboxing is not working or that the user-profiles system is not working.