What happens is, when I log into last pass either via biometrics or master password none of my vault loads. I clearly have access to the app, because it takes me to the vault but I get a popup saying Invalid Password! and my data is constantly "loading" with that red moving circle. I can still change my settings, update my master password and otherwise do setting stuff that obviously requires you to validly log in. So I know I'm not just entering it "wrong" despite the Invalid Password! prompt.
The same password works on desktop, where I can see my vault + data.
Could you try uninstalling the LastPass app, restarting your device, and reinstalling to see if that resolves the issue? If not, could you try Refreshing Vault and Clearing the Cache for your Vault on the app, then logging out and logging back in to the app to see if that works? You should find these options in the Settings > Actions area of the app.