The Company Portal provides access to corporate apps and resources from almost any network. Your company must already subscribe to Microsoft Intune, and your IT admin must set up your account before you can use this app.
This app requires you to use your work account to enroll in Intune. Some functionality is unavailable in certain countries. If you have issues with this app or questions about its use (including your company’s privacy policy) contact your IT administrator and not Microsoft, your network operator, or your device manufacturer.
https://docs.microsoft.com/Intune/EndUser/using-your-android-device-with-intune
Before you can uninstall Company Portal, you need to unenroll your device from Intune first. Here are the steps:
1) Follow these directions to unenroll: https://docs.microsoft.com/intune/enduser/unenroll-your-device-from-intune-android
2) Now, you can uninstall Company Portal like you would any other app
