Hello there, kirkr555.
Thanks for reaching out to us. It's my goal to help fix the IDispatch Error 36679 in QuickBooks Desktop.
This error can be resolved by updating your QuickBooks Desktop to the latest release version. I'd be glad to share below the steps on how to do this:
After the update is complete, you can restart your QuickBooks. Once prompted, accept the option to install the new release.
For a complete guide on how to update QuickBooks to the latest release version, you can check out this article: Update to the latest release of QuickBooks Desktop.
After performing these steps, you'll now be able to submit your MTD Vat to HMRC.
Know that you're always welcome to come an visit us again if you have other concerns. I'd be more than happy to help.