QB Issue Resolution:

Try logging off and logging back into Mac qb.  Open the data file.  Try again.  If that doesn’t work, contact support in the morning.

Resolution for Issue 'Attempting export from Quickbooks Mac to online. Prompted to update, but newest version is installed. Verified & Rebuilt Data. No joy.' available: Yes (Solved).
Source: Intuit Community forum.

Attempting export from Quickbooks Mac to online. Prompted to update, but newest version is installed. Verified & Rebuilt Data. No joy.: 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 Attempting export
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Error Recovery for Attempting export [Canada]
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