Since you are using a Desktop version, please see this help article for troubleshooting steps for Windows products for Desktop. Sometimes just logging out, restarting your devices, and logging back in helps. Some users have found that restarting their wi-fi connection resolved this issue.
If this issue occurs when you are trying to enter your billing address, check to see if the address you are using matches the Post Office designation for the address and zip code for the location. You can check zip codes at this Post Office webpage.
If you are paying for filing your state return, and you are using a Windows device, try going to Settings, System, Displays and adjusting the scale or resolution. First try the scaling setting. In your Windows Settings, if you have scaling set to a higher value than the normal 100%, try changing it back to 100%.
If lowering the scaling to 100% didn't help, then it may be screen resolution. Try a lower screen resolution such as 800x600. You can change your settings again later if needed.
If you are using a Mac, the button to complete the payment may be outside the viewable screen. Connecting to a larger monitor can resolve the issue.
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