Are highlights enabled for mobile devices?

I'm currently developing a game that uses the highlight object to make certain important assets pop out. In live games on PC, this works perfectly fine, and will display as intended, but while testing on mobile, the highlights were not there for most mobile devices I tested on.

There was only one that had the highlight object work, and even so, the highlight looked very glitchy, and wouldn't show the outline.

So tell me, is this a problem that only I've been experiencing, or have other people been experiencing this too? Are highlights not available for mobile devices? I've searched forum post after forum post, but most of them have been made before the release of highlights.