Q.I Gave A Kaffir Lime Tree That Has Had Its Bark Removed Or Fallen Off.
We do have a possum that could be the problem is there a fix to save the tree.

Certified GKH Gardening Expert
It does look more like animal damage than diseased or natural peeling bark. Possums will eat tree bark in winter and it's very common in Australia. The only thing you can do is prune out dead branches and try to keep the tree as healthy as possible with correct watering, fertilizing and mulching. Prior to winter, you can net the tree to protect it. Since many of branches pictured are chewed all the way around, it basically girdles the tree, preventing nutrient uptake, killing the branch or tree if the trunk is affected.
https://www.gardeningknowhow.com/edible/fruits/lime/care-of-your-kaffir-lime-tree.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/peeling-bark-on-trees.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/managing-citrus-exocortis-symptoms.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/protecting-trees-from-rodents.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/possum-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/possum-control.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-psorosis-disease.htm