Deny Error SQL 1142
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;)

I have installed 4 phpbb3 forums ru in my server in same SQL database but in separate databases inside.
And i want share phpbb_Users table!
I follow the steps dcz wrote in: http://www.phpbb.com/community/viewtopic.php?f=46&t=562513&start=45#p6498115, 
but after put $table_shared in config.php and constants.php, this error is show:

General Error - SQL ERROR [ mysqli ]

    SELECT command denied to user 'sql1234_user'@'localhost' for table 'phpbb_config' [1142]
    An sql error occurred while fetching this page. Please contact an administrator if this problem persists.

Allready try to GRANT user but show same error, user acess deny to GRANT.