Summary
When Gozynta Mobius gets a $0 invoice from ConnectWise PSA, ConnectWise PSA also sends the tax code as tax exempt. We don't have an accurate way of determining what the tax code from ConnectWise PSA would have been if the invoice wasn't $0 so it stays at tax exempt.
Resolution
To work around this, you have the following options:
1. Set a tax code for tax-exempt
2. Don't send $0 invoices to your accounting system. You can remove them from the Accounting Interface screen in ConnectWise PSA, and they'll stop showing up as unbatched within Mobius.
Additional Resources
See How do I remove $0 invoices in ConnectWise PSA?