Corporate Identifier to allow Personally Owned smartphones

We want to block Personal owned (BYOD) iOS and Android smartphones in the Intune Enrolment restriction. So only corporate owned Apple ABM and Samsung KME and Google ZT devices will be enrolled in Intune. Sometimes earlier we tested by adding the personal devices in Corporate Identifier give those BYOD to get enrolled in Intune even when the Personal Owned devices are blocked in the Intune Enrolment restriction. Today, it is not working as we tested few months before. Error message is "Device cannot be enrolled as Personal" in the enrollment failure monitoring.
Is there any change recently by Microsoft?