QB Issue Resolution:

If you’re actually trying to import exactly “1602 · REM AMEX BLUE XXX09/XXX07” in the ACCNT field, then that’s likely why.  That account name is 32 characters long, but accounts can only be 31 characters long.

 

The mistake is including the account number as part of the name.  Instead, use only the account name: “REM AMEX BLUE XXX09/XXX07” and then it should work.

Resolution for Issue 'IIF Import Issue' available: Yes (Solved).
Source: Intuit Community forum.

IIF Import Issue: 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 ACCNT field
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Error Recovery for ACCNT field [Canada]
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