In QuickBooks Online, you can turn on the sales tax in the company settings. In your case, since you're using MSP program, I recommending reaching out to our Intuit Developers. They can give you the steps how to resolve this "Out of Scop" error.
To reach our developer's support site, please follow these steps:
- Go to this site: https://help.developer.intuit.com.
- Log in using your Intuit credentials.
- In the Questions tab, click on Ask a Question.
Please re-post this on that page.
If you have any questions, please let us know.