1. I have created an 'Initialise Value' in Power Automate, with a PowerApp trigger.

2. I have written a line to put data from a datacardvalue which is a multi-selection people picker (Combo Box) in PowerApp. This line is throwing an error because I don't know how to write multi-select people data into the OnSave property of the SharePointIntegration app.

The whole code for the OnSave property:
If(
CILEntryFormNew.Mode = FormMode.New,
// FormMode.New: Run the flow and reset the form
'CILFlow01-CreateDocumentSet'.Run(
DataCardValue11_1.Text,
DataCardValue7_1.Text,
DataCardValue3_1.SelectedDate,
DataCardValue14_1.SelectedDate,
DataCardValue2_1.Selected.Value,
DataCardValue6_1.Selected.Value,
DataCardValue5_1.Text,
DataCardValue4_1.Text,
Concat(DataCardValue9_1.SelectedItems, Concat(Email)),
Concat(DataCardValue12_1.SelectedItems, Concat(Email)),
DataCardValue8_1.Selected.Value,
DataCardValue10_1.Selected.Value
);
ResetForm(CILEntryFormNew),
// FormMode.Edit: Submit the form
SubmitForm(CILEntryFormNew)
)
3. This code and data from PowerApps form will be fed into a PowerAutomate flow and the datacardvalues are used to update a SharePoint item property in a document set library.
Really appreciate any help, thanks.