Trying to open the Company Portal as a user after Intune Enrollment shows the below
When clicking continue to Enroll you then get the error
The device is already registered in Intune
You will need to re-enroll the device using the following method
Delete ( or as much as you can ) : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Enrollments
Re-enroll PC as the correct User using the Access Work and School Method
If it asks you for the Server URL for MDM you can use this
Trackback from your site.