Hi there, hmunozarechiga14.
The MileIQ app is currently unsupported in QuickBooks Online (QBO). You may need to contact their support for integration.
There are a number of third-party apps that are most compatible with QBO in our Intuit Marketplace website. Here's the link for your reference: https://apps.intuit.com/app/apps/home.
I'm also linking an article that will help you record miles in QBO: Track mileage.
If you any questions, keep me posted by leaving a message in the comment section. I''ll be around to help you further.