Hello Plum,

I see that you've been through a lot of effort to figure out how to get the Sales Tax Liability report correctly while the investigation is still open. The suggestion offered by my colleague above is only to toggle the item and may not affect the report to generate correctly. 

Though, you can try an item or two to check if that would change the amount in the report. However, please take note that making the items non taxable might also affect your transaction reports with sales tax details. Another suggestion is to export the report to Excel and not use the one in QBO for the meantime while the issue is being worked on. This way, you can make some corrections in the report without changing the product and service's set up.

Here's a sample screenshot:

We appreciate your patience while waiting for the permanent fix. I hope your day is good. Take care and stay healthy.