It appears this issue still needs to be fixed. We use Avatax to calculate sales tax. However, B2B tax-exempt accounts are broken, and sales tax is always charged. Plus, there is no documentation related to Shopify Plus B2B and Avatax.
The only workaround I’m aware of is deleting the B2B account and using the personal account to avoid your customer being charged sales tax.
I’m all ears if anyone has found another workaround or fix for this issue.