I'm so sorry to see that this thread wasn't responded to for so long. I'll see what I can do to help here.
It's pretty rare to have login issues on the app, unless your employer has you configured with a particular type of Okta login, where they have a specific series of steps you need to follow. (I saw a couple of you are having that issue).
Either way, we can help - please just open a ticket or give us a call at 866-684-7191. We have a quick step-by-step guide, but it's specific to your employer so I won't be able to post it here on the public forum.
If you're stuck in timeclock mode, have the store manager type their password in to unlock you.