The ability to grant and revoke logons for database users is controlled by the EXECUTE privilege in the DBC.LogonRule macro. User DBC has this privilege by default. You must grant the privilege to any other user who needs to use the GRANT LOGON or REVOKE LOGON statement. For an example:
GRANT EXECUTE ON DBC.LogonRule
See Creating the Security Administrator User for other administrator privileges.
When an administrator with the GRANT EXECUTE ON DBC.LogonRule privilege submits a GRANT LOGON or REVOKE LOGON statement, the DBC.LogonRule macro adds or deletes a row in the DBC.logonRules table for the affected user. See the information about DBC.LogonRulesV in Teradata Vantage™ - Data Dictionary, B035-1092 and the information about GRANT LOGON and REVOKE LOGON in Teradata Vantage™ - SQL Data Control Language, B035-1149.