Is your password longer than 60 characters? If so, you should know that your actual password was truncated to 60 chars at the time of account creation. You won’t notice on the website because the login webform automatically truncates characters beyond the limit, but most 3rd-party apps don’t do this because it’s an undocumented thing.
Basically, my advice would be to update the password in your password manager to be truncated to 60 characters and then try logging in with the app again.