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View profile -> Settings/Edit Profile -> My privacy settings -> To find the word "Inventory" -> Activate "Open - visible to everyone on the Internet" -> Save changes
Market -> Fulfill Steam Requirements: "You must have a valid Steam purchase that is.." and "Your account must be protected by Steam Guard at least 15 days.."
Settings -> Account details -> Top up the balance (you need to top up the balance by $ 5.
"Your account must be protected by Steam Guard at least 15 days.." - this is being decided requirement using Steam Desktop Authenticator (SDA)