QB Issue Resolution:

I just went into the QB Preferences in QB for Mac 2016 and switched the Reporting /Export Report As preferences away from “SYLK for Microsoft Excel 2004” to “XLSX for Microsoft Excel 2008 & 2011, Apple Numbers ’09”.

Resolution for Issue 'Cannot export to Excel anymore with Quickbooks 2016 for MAC' available: Yes (Solved).
Source: Intuit Community forum.

Cannot export to Excel anymore with Quickbooks 2016 for MAC: 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 Export Report
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Error Recovery for Export Report [Canada]
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