Hello, perhaps you want to check out this post:
Vuforia works in one project but not another, no Camera permissions request - Vuforia Engine - Magic Leap 2 Developer Forums
Initializing Vuforia manually after granting the needed permission seems to be the fix.
Even tho you tried it in similar fashian, try again with the code provided in one of the answers, this is my way to go now to use Vuforia on the ML2.
Let me know if it fixes your problem.