Werewolf/Vampire lord hybrid powers bug

Wondering if anyone knows a fix for this. On my current playthrough, I’ve successfully done the vampire lord/werewolf hybrid glitch for the first time. I’ve noticed my Vampire’s Seduction power is missing, and I know I’ll need it to complete the Dawnguard questline. Without adding the power with mods (vanilla playthrough, about time I got some achievements), is there any way to fix this? I’m on Xbox.