I have the same issue on my Mac, also running the latest 13.4 version of macOS. It was crashing on launch. It crashed as soon as it tried to sync with OneDrive.
I disabled cloud sync and Enpass stays open. Looking at my other devices, iPad and iPhone, all three have a sync error working with my personal OneDrive account. The Mac/iPhone/iPad error is the same, "Something went write while syncing with could. Error code: 1215993"
Any ideas why OneDrive stopped working as a cloud sync location?