Just for context, this is the same new member who posted just a couple days ago that he had repotted some Phals from sphagnum into Orchiata, I believe Power (medium) size, and was watering twice a day because the roots at the side of the pot would quickly become pale colored. Most of us who responded there suggested that was too much watering and to cut it back to every other day or so.
Overwatering in Orchiata Bark?
cherrypuff, I'm sorry this is happening. I think there must be something about your growing conditions we're not understanding. I myself have repotted many plants over the years that arrived to me in pure sphagnum, and because I'm not good with sphagnum, I repotted them into Orchiata. I've never lost one. I do give them time to adjust to my temps/light/humidity for anywhere from a few days to a week before surprising them with a repot. And sometimes, if they are in very tightly packed moss, I will cut down the sides of the pot to expose it to more air and loosen up the sphagnum for a few more days before repotting. So, in other words, I try to give them a gradual introduction to living a different way at my house.
The other members who have already posted here have offered suggestions that I hope will help you revive this plant. And as one member suggests, perhaps more photos will help us.
Edited to add link to previous thread.