To access The Advocacy’s company data on a personal iOS device, you must enroll it in their Microsoft Intune portal using the Company Portal app.

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Install the “Company Portal“ app from the iOS App Store; it can be found here: Company Portal App
Once downloaded, open the app and click SIGN IN. You will be prompted to enter your Advocacy email address and password, plus multifactor authenticate the login.
Tap Begin to start the process and review what your organization can and can't see. Then tap CONTINUE.
Download the management profile by clicking “Continue”. Then tap Allow. It will confirm that the profile has been downloaded.
Navigate to Settings and tap the “Profile Downloaded” prompt.
Tap Install and enter your PIN, tap Install again, and finally, Trust.
Navigate back to the Intune Company Portal app. Tap Continue.
The final step is to check your devices settings. This ensures it meets The Advocacy People’s compliance policy and will alert you to anything that isn’t right.
When setup is complete, tap DONE.
You will be prompted to select a device category. Make sure to tap Mobile Device