https://docs.samsungknox.com/admin/knox-platform-for-enterprise/kbas/kba-360041291294/ Smart Switch no longer works on Fully Managed with Work Profile devices as it was not designed for enterprise environments. While Smart Switch can be installed and may have worked previously on a device in this configuration, the app was not officially supported in this type of environment and it is now disabled by default starting with version 3.7.05.8. The warning message will now appear and prevent the app from launching. TL;DR - it's not supported, unfortunately.
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