Microsoft has released Windows 10 Insider Preview Build 18895 to Insiders in the Fast ring. This build is a quick fix for the Your Phone app that broke in build 18894. Other that that, it is mostly additional bug fixes. You can update to the latest build by going into Settings -> Update & Security -> Windows Update and then checking for new updates. The latest build is 20H1 (20H1) with additional fixes for older versions of anti-cheat software used with games.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-build-18895-fixes-the-your-phone-app/