Apply button does NOT work with the legendary cata daggers, keeps playing the sound like it applies but does not. If I change to a normal other dagger it applies fine.
Edit: credit to Saimeren for the solution:
Rogues, when selecting your legendary, right click the picture in the menu and choose the other option. You can only mog the left hand into the left hand and the right hand into the right hand. When you right click the picture, the drop down menu shows up and you have to select the main hand separately.
This still doesn’t work for me. I’ve already tried the method where you right click the correct hand weapon to transmog but still nothing. It’s either bugged or simply poor user interface.
It might help if the mh/oh designation was simply removed from the original Fangs. Having to match them in the right click menu isn’t exactly intuitive, and it will be extra wonky when switching between sub or mut and outlaw and making sure transmogged daggers are equipped in the right slots to not break it.
Okay I finally got it working. The default legendary dagger in the transmog list is actually the OH one. I assumed it was MH and had the two in reverse. Definitely could’ve been designated better/more clearly.
Just had to help wife figure this out. Ok I had to select the main hand one in the interface for the main hand the G name one. Hit apply then I had so select the off hand one T name then hit apply and it worked, deselected enchants just in case but it worked in that order.