In-app notifications give the user notifications within the model-driven app and these notifications can be seen when using the app. Other alternatives for notifying users are e.g. using [https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/formcontext-ui/setformnotification form notifications] (with JavaScript) and Power Automate Cloud Flows to send e-mails or using the Microsoft Teams connector to have messages in Teams.
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In-app notifications give the user notifications within the model-driven app and these notifications can be seen when using the app. Other alternatives for notifying users are e.g. using [https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/formcontext-ui/setformnotification form notifications] (with JavaScript) and Power Automate Cloud Flows to send e-mails or using the Microsoft Teams connector to have messages in Teams. With [[Plugins]] you can use the [https://docs.microsoft.com/en-us/powerapps/developer/data-platform/best-practices/business-logic/use-invalidpluginexecutionexception-plugin-workflow-activities InvalidPluginExecutionException] in order to e.g. prevent saving a row as part of some business logic.