The issue where the Delete button is greyed out for your custom prompt in Copilot Studio could be due to the fact that the custom prompt is currently published or associated with a live configuration, which prevents deletion. Even though you have already deleted the underlying solution, it seems like there might be lingering dependencies or connections keeping the prompt active.
Ensure that no other solutions or workflows are actively referencing the custom prompt. Check topic triggers, external workflows, or connections that could still be utilizing the prompt.
Thanks.
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