Convalescence Spirit Requirement Bug

THANK YOU SO MUCH!!! THIS WORKED

Just wanted to add my own experience:

Apparently Ravenous Swarm also counts for this issue.
I deactivated it for Slot 2 and Convalescence worked.

I am having the same experience. I have the same equipment set to both weapon sets and more than enough spirit to run it. It even lets me activate the skill, but I can't actually use it. So it is reserving the spirit but is unusable and is not telling me why.

I also discovered a related issue on my end. It turned out the problem was caused by having an Unset Ring with the skill slotted into it. After removing the ring, I was no longer able to use the skill, and I received a warning that I was missing the required Intelligence on my second weapon. In the end, the fix was simply to remove the slotted skill from the ring and place it into another available slot.

I have similiar issue with both convalescence and blink.

I meet both spirit and attr req in both weapon slots but it just wont take spirit and allow me to use abilities.

I've tried doing everything from removing all other equipped skills and so on - these skills just wont work for me on two different characters (chalupa and chrono).