We have a powerapp when I need to populated a sharepoint list column with a list of Attendees. Attendees are always someone in the company so I use a multi-select combobox utilizing the Office365Users.SearchUserV2. I am able to get it to work when only one person is selected but once I try multiple people selected it will only send over the last person selected. Any help with this would be greatly appreciated.
Items code on the combobox iteself

But then on the Update of the Datacard itself it doesn't like the SelectedItems choice

Also the Sharepoint list columns is a Multiple Line Text