POE 2 Acolyte of Chayula - Can't seem to use my GCP to add quality to the "Into the Breach" skill

As the title says, it seems using a GCP on the ascendancy skill "Into the Breach" won't work. Even though it clearly says it increase the spawn frequency with added quality.

Is this an actual bug or is there another gem qual currency I haven't seen? Or is it meant to be gained through the passive tree or some other way?

Thanks! Loving the game!

https://imgur.com/a/nSpMQS7 - Quality Details

Hard to take a SS of trying to use the gem since it literally won't let me apply it.

Same, can't use GCP on unbound avatar from Invoker

This is probably intended ? Would, a placeholder for the enhance gem perhaps.

bump, it says it gets benefits from quality but can't be qualitied using gcp?