Are you logging into the Steam client from a new computer? Here’s the Steam Guard code you’ll need to complete the process:
5G9R3
from the computer located at180.183.87.67 (), someone else may be trying to access your account. You can view more info about this login attempt online.
If you suspect someone else may be attempting to access your account, please either:
Change your password immediately orLock your account online and then request Support assistance to regain access to your account.
Thanks for helping us maintain the security of your account.
The Steam Support Team
https://help.steampowered.com