QB Issue Resolution:

I do understand that bank errors are frustrating.

This is the info I have for that error:

Note: If you get this error with Key Bank, you’ll need to log in to the account from the bank’s site and make sure the option to allow third party access is selected (Self Service Tab > Security Center).

A 102 error usually means that your bank’s website is experiencing technical difficulties or undergoing maintenance. Here are some suggestions:

Check that you can log in to your bank’s site through the URL they’ve provided our online banking service. See KB 6504: http://support.qbo.intuit.com/support/answers.cfm?faq_id=6504
If you’re able to log in successfully, look for a message indicating that something isn’t working as it should. Also, make sure that you can see your account summary, account history, and account transactions without a problem.
If you don’t see any indications of a problem or maintenance on your bank or credit card’s website, you can try to manually update your account within QuickBooks Online. See KB 6290: http://support.qbo.intuit.com/support/answers.cfm?faq_id=6290
Wait at least a day before trying again in order to allow the bank time to fix any problems with their servers.
You can also get this error if your account at the bank or credit card is new. Some new accounts don’t work with online banking right away. To see if this is the issue you’ll need to contact the bank or credit card company you have this account with.

Still need help? To contact QuickBooks Online Customer Care, sign in to your company and click the “?” (question mark) > type Support > click More Support Options > click Contact Us.

In the meantime you can use web-connect to import a bank data file directly into QuickBooks Online. For more information, see KB 6019, Using Web Connect.

Resolution for Issue 'I have trouble to get CitiBusiness credit card account update automatically. The error message: “Bank Account Error 102”.' available: Yes (Solved).
Source: Intuit Community forum.

I have trouble to get CitiBusiness credit card account update automatically. The error message: “Bank Account Error 102”.: 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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