Steam Support does not reach out to people by Steam chat or Discord. Anyone approaching you that says they're from Steam Support (or SteamRep) and asks for your account information or items is a scammer.
Login via Steam

Notable Affiliates: 3

Warning: This page lists some well-known figures within the community, who have joined SteamRep's Notable Affiliate program. We have verified their identity before listing them here, and they are commonly impersonated, so make sure you verify who you're dealing with. We do not vouch for or endorse their character or trustworthiness, and make no guarantee beyond their identity.
2010-10 No special reputation Banned Friends:
8 out of 1629
2009-02 No special reputation
2013-03 No special reputation Banned Friends:
1 out of 475

Valve and Steam are registered trademarks of Valve Corporation.
SteamRep is hosted by the non-profit Online Fraud Prevention Foundation and is not affiliated with Valve in any way.