Marvel Rivals is a newly released team-based superhero shooting game.
This game has received widespread attention from many players, especially Marvel superhero fans.
It is released for multiple platforms, including PlayStation 5, Xbox Series X/S, and Microsoft Windows.
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Try running without the -dx12 or -d3d12 command line argument.
How to Fix Marvel Rivals DirectX 12 Error
Fix 1.
If not, you may consider upgrading your graphics card.

To check the graphics card model with theDirectX Diagnostic Tool:
Fix 2.
Then you’ve got the option to go to theDownloadsfolder to start the installation process.
Wait for it to be completed, and then start your system to test whether the issue is resolved.
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Fix 3.
Fix 4.
Open Steam, and go to theLibrarytab.
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In theGeneraltab, bang out-dx11under theLAUNCH OPTIONSsection.
Step 4. reboot your box and verify if Marvel Rivals works well.
Listed above are several possible solutions.
you’re able to follow the instructions described to apply these fixes.
If they do not work for you, you may need to wait for the official patch fix.