QB Issue Resolution:

Please try using the bank’s URL and use another browser to connect your bank account. If you get the same results, please check your financial institution’s website to see if they’re having a connection issue.

If you get the same results, I suggest contacting us by phone so one of our phone agents can look at this at a closer view.

Resolution for Issue 'Error connecting bank account: “We could not complete this request because some information is missing.: FIName”. How do I resovle this error?' available: Yes (Solved).
Source: Intuit Community forum.

Error connecting bank account: “We could not complete this request because some information is missing.: FIName”. How do I resovle this error?: 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 Account
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Error Recovery for Bank Account [Canada]
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