It's telling me that I have to fill out Form 310 Line 1 for a solar tax credit, but I didn't add this as an option

This is a known issue.  Please click on the link below for updates.  TurboTax will advise you when the issue has been rectified.

Arizona updates for Form 310

You can also try the following as it may rectify the issue as well.

After you log into TurboTax and select the Federal section located in the black panel on the left:

1. Select Deductions & Credits 
2. Scroll through all tax breaks until you see the section titled Your Home.
3. To the right of Home Energy Credits, select revisit 
4. The next screen will be titled Energy-Saving Home Improvements.  Scroll down to the bottom of the page and select "No, we did not make energy-efficient improvements or have any carryforward."
5. This should remove the credit from being pulled into your state tax return.