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What fixes there are have been largely community sourced through trial and error across Discord, Reddit and forums.
Marvel Rivals Error code 10
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While it covers general connectivity, it often appears for platform or location specific issues.
You should also check your game is fully up to date.
However, one fix that seems to have worked for people is turning their wifi off and on again.
It does mainly seem to be PlayStation focused, and potentially suggests a internet error specific to that platform.
That said, there’s at least one report of the fix for code 21 below working on it.
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