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Summary: The Generate Sample Data feature for a Record Type fails. The issue also reproduces with a newly created, minimal Record Type.
Environment: News / Region: Unknown / Appian Version: 25.4
Issue: In Data Preview → Generate Sample Data, the following message appears:
We encountered an issue and could not generate your sample data.
Click REFRESH ALL DATA in the Additional Configuration panel and try again
What we’ve verified:
Discussion posts and replies are publicly visible
This looks like an environment level issue. Did you find anything in system logs? If not, better to raise an Appian Support ticket.
You should reach our to your teammates in your organisation. Someone with access can raise the request on your behalf.