You moved to Xero from MYOB, QuickBooks, or a desktop file. Someone migrated the data. The new system mostly works, the bank feeds mostly reconcile, and the chart of accounts is approximately right.
But the trial balance does not balance. The opening figures came across as a single lump sum nobody can break apart. Categories were imported by guesswork. You ask the same five questions every quarter because the GST coding is wrong on half the line items.
Xero is good software. Xero set up well runs a business. Xero set up half-finished is harder than the system it replaced. The setup is a discipline, and Trinity does it weekly: chart of accounts built around how your business actually runs, opening balances reconciled to the dollar, bank rules tuned over the first quarter rather than left at defaults.