Watched the video linked above, and did some testing myself in the Shooting Range. TLDW: tempest strike only activates when killing certain enemies.
Works:
Dread, Husk
Corrupted Lurker
Unyielding Servitor
Ravenous Taken Wizard* ,Taken Goblin* , Servile Phalanx
Honored Legionary*
Acolyte*, Revenant Knight, Blistered Wizard*
Goblin*, Quantum Minotaur
Doesn't work:
Subjugator
Stalker, Tarnished Wraith
Dreg, Resolute Captain
Psion, Esteemed Centurion
Malignant Wyvern
* : These enemies were returning my dodge, but inconsistently, ranging anywhere between once and a handful of times.
If its needed, I'd be more than happy to record some testing footage
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After playing with the build since I made this post, I have come to the conclusion that having tempest strike activate combination blow is tied to the thin line from the attack making direct contact with the enemy. if the line doesn't hit them, then combo blow doesn't activate, even if the aoe from that line does hit them. This can also occur if you're too close to the enemy, and hit them with a burst of aoe when you activate tempest strike, killing the enemy but not activating combo blow. I believe some enemies still just don't work, but I could understand if that's just due to the above behavior, and I'm not noticing it
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Hello there, Thank you very much for reaching out to us. I'm sorry to hear that you are having trouble with the combination of this ability and aspect. We've taken note of your detailed report and will continue monitoring any underlying issues that may be occurring. For any updates that may come from this report, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url].