QB Issue Resolution:

First try logging in directly to Citi bank.

Then try the steps in this post.  disconnect/reconnect.  https://www.artesanibookkeeping.com/disconnect-bank-feed/

Resolution for Issue 'My Quickbooks is not updating the Citi Business Account. Can you please fix the connection?' available: Yes (Solved).
Source: Intuit Community forum.

My Quickbooks is not updating the Citi Business Account. Can you please fix the connection?: 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 business account
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Error Recovery for business account [Canada]
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Additional Support Options: