Sign in to Power App in Sharepoint issue

Hi guys,

I've created a Search Function in PowerApps and integrated the app to a Sharepoint site. Ideally, everyone should always be able to access the search app, but unfortunately, both me as an admin and other users always have to sign in again to use the search function app.

Does anyone has an advice for me to handle this problem? I've already searched for solutions, but they didn't work for me.