QB Issue Resolution:

a pending invoice is an invoice that was created and then marked pending instead of Final.  open the invoice and near the top is a button that says “Mark as Final.”  click it.

Resolution for Issue 'I have a “pending” invoice and would like to apply payment. Do not know what a “pending” invoice is or how it got that way.' available: Yes (Solved).
Source: Intuit Community forum.

I have a “pending” invoice and would like to apply payment. Do not know what a “pending” invoice is or how it got that way.: 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 apply payment
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Error Recovery for apply payment [Canada]
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