Sorry about that. It's a feature in Beta. Install the Beta, and give the feature a full runthrough. I seem to recall that I needed to have it functioning in Beta before it was recognized and working in a standard version. Please try it there, relaunch Premiere Pro, and then report back. Is it working yet?
In the Cloud Desktop, look at the last category in the "Categories" group - it is "Beta apps." You'll see "Premiere Pro (Beta)" there. Once you install PR Beta, it will show up in the Updates section also. It is treated as a separate program from the release version of PR (currently 15.2). When you look in your programs to run it, you'll see it as "Adobe Premiere Pro (Beta)."
Thanks for the suggestion. I have installed the Beta version and while it shows the three options, including Transcribe Sequence, when I click on that option I get a message telling me to request access tothe early access program. But I've already received confirmation that I've been given this access.