 or 502, Portal server may be down or unreachable Problem: No tax rates shown in Tax Rates checkbox section of product editor Verify Invoice Plugin is active and enabled Go to Invoices > Settings > Tax Rates and create at least one tax rate Refresh product editor page to load new tax rates Check that tax rates are not marked as inactive/deleted Problem: Product company dropdown empty or missing expected company Verify Invoice Plugin is active Go to Invoices > Settings > Companies and create or enable company Refresh product editor to load updated company list Check that company is not marked as inactive