As stated in our release notes:
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This release has the following technical changes:

Migration of OpenShift Container Platform 3 to OpenShift Container Platform 4 requires a legacy Migration Toolkit for Containers (MTC) Operator and MTC 1.7.x.

It is not supported to migrate MTC 1.7.x to MTC 1.8.x.

You must use MTC 1.7.x to migrate anything with a source of OpenShift Container Platform 4.10 or earlier.

MTC 1.8.x only supports migrations from OpenShift Container Platform 4.10 or later to OpenShift Container Platform 4.10 or later.

MTC 1.8.x by default installs OADP 1.2.x.

We want to ensure that we call out this information in our support policy. Specifically, that 4.10+ is only supported with MTC 1.8 and that you cannot migrate across the two version.

Task is to update the OpenShift 4 Life Cycle and Support Policy page with this detail.