QB Issue Resolution:

You can go to Citi’s website & download the transaction in to a file. Then under banking choose bank feed & import the file you downloaded.

Resolution for Issue 'Is there a work around for downloading two different Citicards that are not linked?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a work around for downloading two different Citicards that are not linked?: 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 bank feed import
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Error Recovery for bank feed import [Canada]
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