Hi FournierFinishing,
It's nice to see you reaching out to Community. Having the ability to access your account from any where is essential for establishing your daily bookkeeping tasks. With QuickBooks Online being a cloud based accounting software, logging into your account is possible at any time. I'll be happy to provide the information you need to you can get back to business as soon as possible.
I recommend uninstalling and reinstalling the app to ensure it's up to date and then log into your QuickBooks account using a web browser.
If you're still having the same result, please don't hesitate to contact us. We'd be happy to work with you directly and get you back in your account in a timely fashion.
Feel free to reach back out if you have any other questions. We're here for you!