The macro I attempted to create was as follows
/micon "Reprisal"
/ac "Reprisal" <t>
/ac "Scourge" <t>

Reprisal would activate after a successful parry but scourge was shown in error text to be not a valid ability additionally when entering in the string in the macro interface
/micon "Scourge" it does not display the related icon or any icon at all