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To add your STEAM Guard code/token to 2FAS Auth, you need to add it manually. First, get your Steam account’s secret key using a third-party tool found online (like Steam Desktop Authenticator or SteamTimeIdler). IMPORTANT: These tools are not officially supported by Steam or 2FAS, so use them at your own risk!

Once you have extracted your secret key, follow these steps:

Click the “+” button, then choose “Enter secret key manually”.
Enter “Steam” as the Service name.
Paste your secret key in the Secret key field.
Tap on Other settings.
Choose STEAM from the Type field.