Incorrect US Sales and Use Tax on Receivable invoice; unable to locate Tax Jurisdiction Code

Summary:

Receivables invoice for customer in Del Valle Texas Zip 78617, county Travis, is not calculating tax at 8.25%. Only applied is 6.25% state tax. What is the tax jurisdiction code for remaining 2%? Address values have been confirmed to multiple sources. Source of tax rate - Texas State government - URL https://gis.cpa.texas.gov/search/

Content (please ensure you mask any confidential information):

Tax is incorrectly applied at the wrong total rate on invoice at less than expected rate for customer.

Customer site and account does not have a tax exemption and Sales Tax Inside City Limit is checked. Transaction is not suppressing tax calculation. Vertex Oramast updates are used.