None of the existing geonet posts searching on "An error occurred while generating reports" seem to address the issue I am experiencing.
I have a Survey123 that is long and moderately complex: 400+ line items, a handful of calculations and a handful of relevant calculations. Sorry, I can’t share the template, as it is proprietary.
In survey123.arcgis.com, I select the survey, select the “Data”, generate a sample template (successful), then generate a sample report

.
At the end of the process I get an error :

with no other information.
When I attempt to Generate a report

. After attempting to generate the report I get the

error with no other information.
When I click on the “Show details” link I see this:

Clicking “More details” shows this:

If I remove all fields from the report template, it successfully creates the report.
If I leave just one field in the report template, it fails to successfully create the report with the error:

Questions:
- How do I troubleshoot this, especially for such a long survey?
- Any idea what’s causing this issue and how to resolve it?
TIA