GetWorld()GetFirstPlayerController returns NULL?

Development Programming & Scripting AI
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Hello. I’m working with AI and am using a Blackboard/Behavior Tree in UE4 to organize data, while my Services and Tasks are made in c++. I have that set up appropriately and is working the way I expect it too, but am running into one issue.

Currently, I am attempting to retrieve a list of all connected players in the “OnBecomeRelevant” function.
When running this bit of code, “GetFirstPlayerController()” returns NULL.

    OnBecomeRelevant(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)
    {
      GetWorld()->GetFirstPlayerController(); // Returns NULL
    }

However GetWorld() is not null.

I can run this same code in my TickNode function without issue, but am trying to avoid doing so as I really only need to know this information once when this behavior tree is first ran.

Does OnBecomeRelevant not have access to this information? Or is there a different way of going about this?

Thank you for any help!