There are 3 ways to get SCA on your device. You can download the app directly from the AppStore or you can deploy the App through Microsoft Intune via iOS Store App or Volume Purchase Program-App. You can use SCA with any EMM provider (e.g. Microsoft Intune, MobileIron, Jamf, Airwatch, XenMobile....), cause the App uses a standard protocol, the Mobile Device Management (MDM) protocol from Apple. SCA dedicated for Microsoft Intune supports the core Intune App Protection Policy settings and is capable of supporting advanced App Protection Policy, see Microsoft Intune protected apps and App Configuration Policy settings, see App configuration policies for Microsoft Intune.