I appreciate your performing the troubleshooting steps provided by my colleague, @MikeMBE.
Since you’re still unable to migrate your mileage data to your QuickBooks Desktop account, I suggest you contact our Technical Support Team. This concern might be needed to pull up your account to reassess why this behavior is happening on your end.
The Community space is a public forum, so reaching out to our phone representatives is the best option. They can pull up your account information in a secure environment, and provide fixes immediately.
Here’s how to get in touch with them:
- Go to the (?) Help icon in your QuickBooks Online (QBO) account.
- Select the Search tab, and click Contact Us.
- Enter a brief discussion of your concern and click Continue.
- Select either Chat with us (if you preferred messaging) or Give us a call.
Please ensure to review their support hours to know when agents are available. This way, you can contact them at a time that is convenient for you.
You can always leave a comment if you have further questions about migrating data. I’ll make sure to get back to you as soon as I can. Have a good one!