I have a parent flow which is triggered from the Powerapps and at the end of that flow I am running a child flow which also uses powerapps as a trigger point so in the child flow i'm getting some data from the SharePoint and at the end I added the "Respond to powerapps" action. but I'm getting an error in my parent during the call of child flow
You will need to Navigate back to your ‘Child‘ Flow on the management screen, click on ‘Edit‘ for the ‘Run only users‘.
You can find more details in blog - https://clavinfernandes.wordpress.com/2020/09/04/decouple-the-flow-from-the-power-app-to-prevent-end...
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The child flow trigger should be a manual Power Automate trigger, not a Power Apps trigger. Here's a simple child flow I use in one of my projects. You can't use the Power Apps trigger in the Child flow when you are triggering it from a flow.