Find some solutions to deal with it.
Dont know what to do when you encounter Red Dead 2 Unknown error FFFF while playing the game?
Here is a tutorial.
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If that cannot help, keep reading to get the following advanced methods.
Work with the following steps.
Step 1: TypeCommand Promptin the Windows search box, right-punch the best match, and chooseRun as administrator.
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Step 2: When asked by the UAC window, click onYesto continue.
In this case, you gotta allow the game through the Firewall.
Here is how you’ve got the option to do it.

Step 1: Open theControl Paneland change theView byto theLarge icons.
Step 2: ChooseWindows Defender Firewalland click onAllow an app or feature through Windows Defender Firewall.
Step 3: Click onChange options>Allow another appto add the game to the list.
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Step 4: Tick the boxes for the game under thePublicandPrivatetabs.
Once you completed these steps, fire up the game to see if the error code persists.
you could choose the DNS that best suits your needs, andGoogle public DNSis generally recommended.
Refer to the following operations.
Step 1: Press theWin + Ikeys to open theSettingsapp.
Step 2: Click onInternet & online grid>Ethernet>Change adapter options.
Step 3: Right-hit the Ethernet and chooseProperties.
Step 4: Double-click onInternet Protocol Version (TCP/IPv4).
Step 5: Click onUse the following DNS server addresses.
Step 6: Enter8.8.8.8In thePreferred DNS serverand enter8.8.4.4in theAlternate DNS server.
Finally, click onOK.
Unable to fix the problem of Volume keeps automatically resetting on Windows?
Here are some solutions you might refer to.
Here are the steps to reinstall it.
Step 1: Open theControl Paneland choosePrograms>Programs and Features.
Step 2: Find and right-hit theMarvel Rivalsto chooseUninstall.
Step 3: Then openSteamand search forMarvel Rivalsto download and install it.
Choose one to fix the Marvel Rivals error code 4.
Hope they can help you.