I was able to find an old forum post for exactly the same issue and it appears to be intermittent bug with Venthyr. Relog your Warrior will fix it.
Can I get you to also submit a bug report ingame if you get a chance? This helps with the player impact tracking they see as not everyone reaches out to us.
I also moved this over to the UI and Macro forum for better coverage.
I had to relog 3 times. the first and second time nothing happened so I switched over to using the ability as normal(without macro code) and after some BG’s I read your reply and I relogged and this time it worked… You lifted a curse on my Warrior Tritambarum by just leaving a reply I think … im going to report the bug “in game” as well.