Skyrim, Relentless Power, Screams?

And here we're again.

I'm to demonstrate the first cry / the first word at the gray beards.

I have a Dragon Soul, the word is unlocked, but I just can't arm it, and so I can't use it.

I play on the PS4.

what am I doing wrong?

How is this supposed to know here?

No idea, maybe it's a bug and one can help me with that?

If you say the word is unlocked, do you mean that not only did you learn the word, but you also paid a dragon soul to unlock the corresponding cry? Or just that you have learned the word?