Can't change my plan receive error code

Hi jordan-20three20,

Welcome to Community!  It's great to hear that you'd like to take advantage of the current QuickBooks Online promotional offer.  I'd be happy to provide some insight here!

If you've recently signed up for a 30-day free trial of QuickBooks Online, the promotional offer will not be applied.  This is because it's for new customers only.  However, you can continue to upgrade your subscription, by following the steps here.

Please don't hesitate to contact us if you require additional assistance.  It would be our pleasure to work with you directly and ensure you're able to upgrade your account without delay!

If you have any other questions, please feel free to reach back out.  We're always glad to help!