This is scary as.I’ve found a really easy way to bypass the fingerprint/PIN authentication that protects all of your 2FA codes. The Android app, produced by LastPass, doesn’t use the same protection that their flagship app uses (like locking when idle, lock on screen off, etc).
All you need is access to individual activities (“screens” of apps). You don’t need root to access these; pre-Oreo you can use an app like Adam Szalkowski’s Activity Launcher or if you’re on Oreo you can use sika524’s QuickShortcutMaker.