Unfortunately LastPass suddenly stopped working on my mobile device (android). Fingerprint was no longer active and the password included was marked as wrong, blocking the account. Luckily now It works well from the browser, with the same password that was actually correct.
When it stopped working it was not even possible to activate any measure to recover the password (since the account from the mobile was never recognized and the hind is not readable or editable).
I am quite sure that I do not have problems since the password work from the lastpass website so I can access to my pages. It is impossible to reach a support centre, however what's happening on the mobile phone is strange. I also disinstalled and installed again the app but the problem persists.
I apologize for the difficulty accessing LastPass on your mobile device @Silvia74
Would you be able to update your password iterations from within your account at lastpass.com, to see if this resolved the issue?
Reference guide:
https://support.lastpass.com/help/how-do-i-change-my-password-iterations-for-lastpass