Photo would help a lot....photo of plant, photo of pot and soil. Was it shipped through the mail? What type of soil do you have it in? Humidity? I always root these in soil, but with humidity up. The soil I use is a very "chunky" mix of potting soil with extra perlite and bark (orchid mix)........when watered it becomes moist but still has a lot of open air space.

It was shipped through mail indeed. I try to maintain humidity of the soil and around the plant by spraying it with water. I use a universal potting soil mixed with some chunk of bark and loosely packed.

Now the browning has become more than what you see in this image.

I have attached an image where the pot used earlier is visible. It had beautiful long roots - so chose a pot size accordingly - to not damage roots. And a photo of how it looks today - I cleaned out most of the roots and placed it in water to aid in root growth.

Odd it looks like it was a nice healthy node with nice amount of green. Is the actual stem still healthy and firm looking? Hopefully not rot. How long ago did you actually receive it? I wonder if the browning and damaged roots are from damage occurred during shipping (e.g. box getting too hot at some point) and the plant is just now showing damage.

The thick stem is actually still firm, but the one attached to the leaf is a little flimsy and turning brown. I have it now in water , hopefully that will trigger some growth in the roots.

I only hope it recovers soon.

And I hope that with most of the damages root now removed, the impact of any issue during shipment can be overcome.