Client players are unable to move their characters in build but are able to in PIE

Development Programming & Scripting
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2

Try to print out the TeamCharacters.Num() before you call return.
Something like this

if (GEngine) {
	GEngine->AddOnScreenDebugMessage(-1, 20, FColor::Cyan, FString::Printf(TEXT("%i TeamCharacters"), TeamCharacters.Num()));
}

(You may need to do a development build to not strip out GEngine message access)

I’m guessing you might have less than 3 and your function is ending too abruptly.