The account was stolen . Accounts recently stolen are more likely to be restored by the owner or stop working and you losing the account. Its recommended to buy a safer more older account. Read our recommendations.
Trade is temporarily unavailable (Mobile Authenticator)
This restriction appears if Steam Guard has been recently removed or linked, or if it is not present at all.
Community market is temporarily unavailable (Market)
This limitation appears if the phone or Steam Guard was recently uninstalled. Another possible reason is the absence of purchases on the account for a long time.