Originally Posted by https://support.steampowered.com/kb_article.php?ref=2825-AFGJ-3513
Granting or modifying economy items, or taking actions that devalue players' items, or interfering with the TF2 economy.
If you're using TF2Items to modify item attributes on your server, please make sure you have tf_server_identity_disable_quickplay set to 1 (or you're otherwise not eligible for quickplay traffic).
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