InDesign 15.1.2 was released several days ago but it does not show up in Creative Cloud 188.8.131.521, and I have no way to update ID. As of today, there is also an update 15.1.2 for InCopy, and that doesn't show up either. Running macOS 10.13.6.
Erik Rieselbach commented
As a follow-up, I found this Adobe page on the issue, <https://helpx.adobe.com/creative-cloud/kb/creative-cloud-application-recognizing-available.html>, and tried all the suggestions, including uninstalling and reinstalling InDesign. I remain stuck on 15.1.1.