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Keeping this in consideration, how do I turn off steam restrictions market?
Do in-game purchases count as valid purchases to remove the Steam Community market restrictions? No. You either make a 5 USD worth of purchase in the Steam store or add equivalent amount to your Steam wallet to remove the restrictions.
Then, why do I have to wait 15 days to trade on steam?
Trades created within the first 7 days of adding the authenticator will still have up to a 15 day trade hold. If your account was not protected by Steam Guard via email or mobile app, you will be restricted from using trading and the Community Market for 15 days because Steam Guard has been recently enabled.
15 days