Valve East
Valve west
EU
Brazil
Au
Japan

for a free pass goto discussions and post your region
HERE
Steam Guard Mobile Authenticator issues post here: HERE
and in some cases(free2play to premium)

*Have either purchased a copy of Team Fortress 2 prior to June 23, 2011, or have made a purchase from the Mann Co. Store. (AKA premium accounts)

*Have Steam Guard Mobile Authenticator enabled. ( https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030 )

*Have a phone number associated with your Steam account ( https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030#addphone )

*must be polite and follow the admin moderators directions.