Same answer as my answer at the top of this page, basically. We are not able to get the lossless Atmos assets for the 4K version of that film as of yet.
To expand on that answer up top a little bit -- Kaleidescape is the only service offering lossless Dolby Atmos for Internet-delivered content. Other services that offer Atmos are offering a lossy variant that is more suitable for bandwidth-constrained streaming. Many people are not aware (I certainly wasn't) that content licensors often have separate business units for physical media and electronically delivered media. In some cases, the licensor's physical-media group may have created a lossless Atmos track for, say, their Blu-ray disc, but that asset is not readily available to the electronic-media group, which means it's not available to us. Since no other service was asking for lossless audio, the electronic-media group didn't bother to make one.
Happily, we have made significant inroads on this in the past couple of years, and we are usually able to get Atmos assets with new 4K releases. With older titles, it's a matter of working our way through the catalog. Adding an Atmos track to an existing movie is a significant investment of time and resources that puts such work in direct competition with getting new releases finished as rapidly as possible. I'm sure you guys noticed that we're starting to get TV series in 4K (Jack Ryan, Game of Thrones S1, etc.). That requires many hours of content production and review time, which has to be balanced against revisiting movies we've already processed.
I hope this answers your question at least a bit.