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In this video Audrie Gordon from the PowerApps team demonstrates how to trap if the app consumer has access to the data source required for form submission.
Resource Links:
DataSourceInfo Function-- https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-datasourceinfo
Notify Function-- https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-showerror
Experimental Feature--https://powerapps.microsoft.com/en-us/blog/new-feature-error-handling-and-writing-null-values-to-databases/