Why does my phone phone app say" unable to sync" with my online account?

I appreciate you for letting us know about this, @JD Stevens. I've got your back, and I'm here to ensure you're able to sync your QuickBooks Online mobile app with your QuickBooks Online (QBO) account.

Before we proceed with the solution, May I know where you encountered the error? I would also want to see what you were trying to accomplish in your QBO mobile app. You can attach a screenshot to your reply. This way, I'll be able to provide you with a suitable solution to your concern.

Feel free to get back to me anytime. I'm more than willing to help you get this sorted out. Take care, and have a great weekend!