Logged in to see I had 16 legacy talents. I put them in the nodes I want, hit apply changes and it tells me “unable to learn talents”. I have tried restarting game, my PC, switching characters and yet it says the same on every one.
EDIT: all my guildies did them just fine.
probably a bug 
having the same issue
I had the same issue after resetting the points i’d already assigned with that crossed out circle red icon on the legacy points menu. i had to undo pending changes, then assign the new points (leaving the ones that were already spent) before it let me save those changes
Still a problem, I can’t use the talents.
I wanted to try talented, but I don’t have access to it.
One of my friends got it working some how.
Have you tried unlearning them at the class trainer instead of the legacy UI panel, that managed to fully reset them for me and let me put the points back in.