It is but the myDevice is managed by Corporate using Airwatch, an MDM solution.
The ads are for your personal device should you choose to enroll your own phone into MDM.
It’d be up to Corporate to make the app available on the myDevice. You cannot circumvent the installation restriction as the myDevice lacks the Play Store.
Many “corporate apps” are missing from the myDevice that would be helpful. Like SharePoint. Holy shiznit, that would be a lifesaver instead of navigating the crappy web version on Chrome.