QB Issue Resolution:

It’s a system-wide problem/scripting error that Intuit is working on.  You should report it and try a manual download for now.

https://community.intuit.com/questions/1640087-banking-error-9999-from-wells-fargo-this-has-been-goi…

Resolution for Issue 'Unable to connect to HSBC bank and download transaction. I have reported this earlier.Doing manual download isn’t not viable due to work load, i need it automated.' available: Yes (Solved).
Source: Intuit Community forum.

Unable to connect to HSBC bank and download transaction. I have reported this earlier.Doing manual download isn’t not viable due to work load, i need it automated.: 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.

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