Playing amination montage

Development Character & Animation
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1

Hey everyone, I am trying using animation without using blueprints at all, I need to use blend space and montage animation. The blend space seems to work but the montage animation is not. I have read the topic: How can I play animations strictly from C++? - Character & Animation - Epic Developer Community Forums
and tried the gived answer but it did not work, when I tried to find out why I have figured that GetAnimInstance returns null, probably because I do not have animBP setted (again, I do not want to use any blueprints from any kind).

I have also tried to use the function PlayAnimMontage on BeginPlay:

void ALiving::BeginPlay()
{
	ACharacter::BeginPlay();
	
	this->PlayAnimMontage(this->m_attackAM);
}

And again it did not do anything.

How can I play montage?