QB Issue Resolution:

Because Capitol One has again changed the file format. The file is no longer associated with your account. Edit the account in question and deactivate online banking, re-import the file and your account will show in the list.

Resolution for Issue 'Existing account doesn’t show up to import transactions to?' available: Yes (Solved).
Source: Intuit Community forum.

Existing account doesn’t show up to import transactions to?: 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 Desktop
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