Invalid group uri with Grantee.group = 'Authenticated'

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Following this documentation i tried different ways of specifying groups for updating object ACL

http://amazon.rubyforge.org/doc/classes/AWS/S3/ACL/Grantee.html

grantee.group = 'Authenticated' => "Invalid group uri"

grantee.id = '75........2a0' => "The XML you provided was not well-formed or did not validate against our published schema"

grantee.group = 'AllUsers' => success