QB Issue Resolution:

Let me get the help you need about your Square transactions.

 

In your case, since only one transaction was not imported, I’d suggest creating it manually to eliminate possible duplicate transactions.

 

You can either enter transactions directly via the Bank Register or enter it with a specific transaction form.

 

Here’s a great resource that you can check on for more detailed steps: Add transactions to bank register.

 

You are always welcome to come back in if you have further questions concerning Square transactions, I’d be glad to help. Have a great day!

Resolution for Issue 'A single cash transaction did not import from Square into Quickbooks. All other cash (and credit card transactions) from that day imported successfully. Is there a way to manually import that one transaction?' available: Yes (Solved).
Source: Intuit Community forum.

A single cash transaction did not import from Square into Quickbooks. All other cash (and credit card transactions) from that day imported successfully. Is there a way to manually import that one transaction?: 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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