QB Issue Resolution:

The VAT registration number will only display in actual invoices – it does not show in the preview invoice when editing. To check how it displays for customers, open an invoice you have created and select ‘Print/Preview’ – the VRN will then show.

Resolution for Issue 'Customise invoice. Have multiple problems let’s do one: I have re-entered VAT reg No in VAT Centre but it will not appear in customised invoice except as XXXX?' available: Yes (Solved).
Source: Intuit Community forum.

Customise invoice. Have multiple problems let’s do one: I have re-entered VAT reg No in VAT Centre but it will not appear in customised invoice except as XXXX?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for actual invoices
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Error Recovery for actual invoices [Canada]
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