Greetings! Missing Artifact Weapon Tab

I have a problem. I have been having fun on a twink druid tank recently.

However, I have found that on this toon (lvl 25) not only can I not tmog artifact appearances (in tank spec only) - there is literally not even an artifact weapon tab in the tmog window. I’ve never come across this on an an alt?

I have quite a few of the old legion stuff done and all of my other alts have plenty of artifacts to choose from for tmog. Anyone know why the whole tab is missing for me?