SSO SAML Token Question iOS Safari and App

Generally speaking, your access token (APM MRHSession cookie) is session-based, meaning it's stored in user agent memory. It's then very likely that the iOS app doesn't have access to Safari's memory space to use the existing session cookie. The simplest option is to set the Persistent option in the IdP's access profile, which would make the session cookie file-based. I haven't tested this on an iOS platform, so not sure if that even works, but it's what you'd normally have to do in a SharePoint environment under the same conditions.