You need to recreate the Avatax folder for Avatax for quickbooks. This can be necessary if you're experiencing issues with Avatax.
In QB go to File->Avatax->Configuration and back up all data on these tabs.
It is important to copy down the account number and license key
Close all instances of Quickooks running Avatax.
- Go to where the company file is located and find the Avalara Folder
Open that folder and find the folder with the name of the company file needed, and delete/rename that folder.
Now, open QuickBooks again.
The Avatax Setup Assistant will popup and follow the instructions onscreen.