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I have found a workaround, but I still don't know what caused it. If I edit the workflow and have it write tasks in a "new task list", my issue is resolved.
Install the RTM version of SharePoint Server 2016. The message that you're receiving is pretty clear -- the product has expired.
I figured it out! I had to go into infopath->File->Form Options->Advanced->Edit Default Values->and uncheck the field causing the validation error->press OK->republish the form.
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