I configured Enpass UWP to sync with my Owncloud. It reproducibly crashes while syncing and closes. When I restart it, it asks for my master password, starts syncing and crashes again which makes the application unusable for me. The only way to get a working Enpass is to uninstall and reinstall it. Syncing does work in Windows Desktop and Android versions. If there's any way to get to a log file or anything else that would help you to debug this, I'm happy to provide it.