QB Issue Resolution:

The file from QuickBooks had errors. CRA data people were helpful in finding them and instructing me on how to fix. The issue stemmed from the address not being completed in Payroll Settings, Tax Settings, Filing Address.

I removed two lines from the xml file: pstl_cd and cty_nm near the top of the file.

Resolution for Issue 'Has anyone had a CRA submission error after submitting a QBO T4 XML file? CRA says it does not conform to their specifications.' available: Yes (Solved).
Source: Intuit Community forum.

Has anyone had a CRA submission error after submitting a QBO T4 XML file? CRA says it does not conform to their specifications.: 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 Filing Address
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Error Recovery for Filing Address [Canada]
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