Add Mobile Locker to your MDM
Most people can install Mobile Locker from the Apple App Store, but if your company uses a Mobile Device Management (MDM) system to push apps to iOS devices, you may need to follow the instructions on this page.
Mobile Locker in the Apple App Store
This is a direct link to Mobile Locker in the iOS app store:
https://apps.apple.com/app/apple-store/id441943186