My assumption is Easy Voice triggered the license check for the TTS voices since that is the phrase in the error, but as I said I cannot recreate it. The 'mystery phrase' was not recorded by Easy Voice. If you install one of their voices and do not purchase it (just try before buy) you will hear the 'mystery phrase' spoken at least once per speech. I can clear them but they come back on next launch. I don't seem to be able to recreate it, but in this scene these same errors return. Adding new voices (same scene) does not appear to create new errors. The errors do not prevent the scene from running.
One of the voices is apparently Arabic (which I remember choosing by accident, I thought I had deleted it without creating the audioclip but I am not sure.) If I clear the errors and save, then re-open the project, they are there again in the console. I have re-written a few of the dialog, replaced some dialog and created new ones, and I am not sure which voices caused (are continuing to cause?) the errors. The errors only show until after I have closed the project and re-opened it - they show on launch.
My dialog is recorded and saved as expected, so there is no emergency and Easy Voice is working.