T17 Map Device Slot Bugged

I have now completed 3 T17 bosses and the extra map device slot is not unlocking.

After the first clear I did receive the in-game notification that it is unlocked, however the map device itself didn’t update.

Anyone know a fix or why this may be happening. They were not Valdo's maps.


JK, it may be that I needed to complete the Atlas invitation for T14+ first.