QB Issue Resolution:

I’d like to share some details why your 940 tax reminder is still showing even if you’ve already paid it through QuickBooks Online.

This is currently an ongoing issue which our engineers are working through. Right now, they are working for an immediate fix.

I’d recommend you to contact our QuickBooks Online Customer Support Team. Our QuickBooks Online Customer Support Team can add your account to a notification list to receive updates.​ Once you’re added, we’ll be able to keep you posted with the progress on this issue.

You can get the QuickBooks Online contact information through this link:​​ How and when can I contact Support?

Resolution for Issue 'Is there a way to get Quickbooks to recognize that the payment has already been generated and get rid of the 2017 940 entry that keeps coming up?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way to get Quickbooks to recognize that the payment has already been generated and get rid of the 2017 940 entry that keeps coming up?: 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 2017 940 tax payment will not go away
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Error Recovery for 2017 940 tax payment will not go away [Canada]
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