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Revoke the web-sites and applications you dont trust, might fix the issues ?
"Error code 412 Precondition Failed can be returned when the knowncode parameter is invalid or does not represent a match sharing code that belongs to the user.
The website or application should stop attempting further calls until user gets a chance to supply a valid match sharing code from their match history"
OP's problems have to do with buff163 app, not with whatever u wrote here...
''The website or application should stop attempting further calls until user gets a chance to supply a valid match sharing code from their match history"'' like what is this all about? lmao.
Phone number, do the code and connect your steam account. Remember unless you have Alipay and a passport you cannot deposit to buy from there unless you have someone who has Alipay access