As far as I can tell, the MAG241C is only "GSync compatible" according to MSI themselves.
I don't believe MSI have shared the scope of their testing.
According to Nvidia, the compatibility verification is:
G-Sync compatible testing validates that the monitor does not show blanking, pulsing, flickering, ghosting or other artifacts during VRR gaming. They also validate that the monitor can operate in VRR at any game frame rate by supporting a VRR range of at least 2.4:1 (e.g. 60Hz-144Hz), and offer the gamer a seamless experience by enabling VRR by default,
What kind of frame rate are you running when you're seeing flickering? You may be limited to a higher minimum FPS range (ala FreeSync) with GSync.
The Freesync range of that monitor is 48-144Hz, so that may come over to GSync. If you're seeing dips <48FPS, that could be problematic.