Modern Warfare 2 “Disconnected from Steam” error: How to fix, possible reasons, and more

Presently, ​Modern Warfare 2 seems to be having a fair number of issues with its launchers on PC. Both Battle.net and Steam have suffered from glitches and bugs since their release dates.

What causes this error? My steam is working, not disconnected at all : r/ModernWarfareII

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