Hello there,
I am currently building an application in which the rejection/approval of submitted records is done within the Power App.
What I want is that after a button is clicked within the app, a flow is triggered which will send out an e-mail. The mail address can be found in the record of the selected ID within the app. The flow currently looks like this:

What I struggle with is how I get the item ID of the selected ID in this case. Currently, the button has the following code:
RejectionMail.Run(ConcessionGallery.Selected.ID)
But it seems like this is not the correct way to retrieve the ID, as I get the following error:
"The method 'Run' has an invalid value for parameter 'Getitem_Id'"
Does anyone know what I should do to solve the issue, so my flow can retrieve the correct record information and thus send the mail to the right address (among other things)?