Hi there,
Glad to have you join the Community. QuickBooks is a versatile program that's designed to help you save time. I'll be happy to guide you in the right direction so you can get back to doing what you enjoy.
It's important you're able to log into your account with ease. I recommend troubleshooting this by uninstalling and reinstalling the mobile app. This is a good way to troubleshoot bugs that affect the app. By reinstalling it, this also ensures you're on the latest version of the mobile app. You can visit these links to reinstall the QBO mobile app:
Give this a try and feel free to keep me posted on how you make out. I'll be here.