Copilot ignores AI instructions added in Prep data for AI interface. Q&A are turned on, dignostic logs show that custom instructions are there but "IndexingEnabled": false and there is not option in Prep data for AI settings to turn it on (option not visible in the interface, both in service and Desktop). What is suprising, in rare cases it looks like Copilot followed the custom instruction e.g. in some but not all summaries generated with subscriptions - no true patern detected there.Issue appears in import / direct query/ live connection modes, Desktop is up to date (April 2026 edition), aplies to evey semantic model tested."CopilotAgentId": "PuPr_Service_ReportConsumptionAgent_202408" in the service.Any thoughts or suggestions how to make it work?

Hi TomaszKoc ,This looks like a rollout gap. The Indexingoption isn’t available in all tenants yet, so seeing"IndexingEnabled": false is expected. Until indexing is enabled, Copilot may apply instructions inconsistently. Since the old DAX option was retired, the new indexing pipeline is required. Best step is to confirm with Microsoft support if your tenant is included in the rollout. Once indexing is enabled, the toggle will appear and instructions should work reliably.Please find the attached file for your reference:Prepare Your Data for AI (preview) - Power BI | Microsoft LearnRegards,Community Support Team.

Prep data for AI - AI instructions ignored by Copilot, no Copilot indexing option in the settings

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