As explained in the title, the VFX Spawner device doesn’t work inside UEFN, not sure if this is because the device is not completely transferred into UEFN, but seeing that the VFX Creator works I figured this might be a bug.
How to replicate: Inside UEFN / Live Edit, add the VFX Spawner device, the effects will be displayed inside Live Edit but will not be visible inside UEFN.