My company just started requiring Microsoft Intune Company Portal app to use Teams and Outlook. From a friend in IT infosec at another company said the app can push apps, require certain settings, password requirements, or OSs, and can see a lot of stuff on your phone. I don't think this level of intrusion into my personal phone is warranted or ethical. Be warned. I'm just going to uninstall and suffer the internal political consequences.
Depending on the industry / region in which you work, they will have regulatory obligations to protect sensitive data such as PII and PHI. From a business perspective they are trying to remove liability and decrease of obvious attack vectors they have limited control over. From an individual perspective, they are implementing controls that protect the privacy rights of their customers. As a security professional, it's good to see. Personally I would always prefer to keep work and personal items separate to reduce the chance that I'm the cause of a breach.