One of the two lights on the rear of my wife's 2016 XE has come loose (see photos below).

It fits in the hole, but doesn't appear to be secure, leading me to wonder if something has broken, or perhaps there is a knack to getting it back in that I'm missing.

Any thoughts or suggestions?

 

Looks like your tab is broken on one side... I did a quick search on jaguar license plate light and found this:
https://www.ebay.com/i/313181013863?...xoC23kQAvD_BwE
and this:
https://www.ebay.com/i/313181024270?...RoCwokQAvD_BwE

 

Thanks