When using Person Account fields (API names ending in __pc) as merge fields in Prompt Builder, the template may display "{!$Input:Account.MISSINGFIELD}" upon reopening.
This occurs because Person Account fields are currently not supported in Prompt Builder.
To reference these values, consider using the equivalent fields from the Account or Contact objects (API names not ending in __pc).
Currently, Person Account fields are not supported as merge fields in Prompt Builder.
A related idea has been posted on IdeaExchange. To support this functional enhancement, please consider voting for the idea: Enable use of Person Account merge fields
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