QB Issue Resolution:

They pretty much broke the function without actually improving .iif functionality.

QB never honored “Number” in .iif imports.

The Email Later should still work, as well.

The Import has an error message process, and it seems to reject things it used to allow just fine.

Resolution for Issue 'Regarding IIF imports and QB 2019: Changes to the format or are these bugs?' available: Yes (Solved).
Source: Intuit Community forum.

Regarding IIF imports and QB 2019: Changes to the format or are these bugs?: 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 Email
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