Enable Certificate authentication on the iOS PowerBI app.
Certificate based authentication is supported in Power BI iOS and Android apps for Power BI capabilities. This is published in AAD documentation: iOS mobile app - https://docs.microsoft.com/en-us/azure/active-directory/active-directory-certificate-based-authentication-ios Android mobile app - https://docs.microsoft.com/en-us/azure/active-directory/active-directory-certificate-based-authentication-android
