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Please confirm if username "OracleSystemUser" is new weblogic user or not.
Also try clearing cache following document How To Clear The Server Cache Directories (cache, stage, tmp) [ID 1323602.1] and restart servers to check if it works.
Make sure proper roles is assigned to the user.
Go to the admin console-security realm and check for your users and verify the roles (it should be same as default weblogic user roles)