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Check that your SessionName isn’t too long or using special characters.
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Ensure the server is set to Public rather than LAN-only (you’ll see this in your server’s config or the Twisted Servers control panel).
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Make sure you’re matching filters in the ARK in-game browser (e.g., correct map or PvE/PvP mode).
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If you’ve recently restarted or updated, give it a bit more time to register with Steam. (Ark servers typically take 5-10 minutes to fully load, on the longer side if you have Mods.)
