Once you connect your database to Xero, you will see that there are now 11 steps in your Month End.
Within step 11 you will be able to export the statements to your linked account.
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If there are any Owners or Accounts which are not linked or not linked correctly, an error message will appear stating which owner/s and account/s are not linked.

Once you have fixed the Linking issues, you can export the statements again.