Assuming you are using a single-active cluster (multi-active clusters
are not supported), this is what I would do:

1. Discover the Windows cluster
2. Migrate the cluster, which will migrate the active node

Then, you have a choice to make.

Option 1:

3. Fail over the cluster
4. Refresh details in Migrate
5. Migrate the cluster, again moving the now-active node
6. Repeat as necessary for all passive nodes

Option 2:

3. Discover the passive node as an individual machine (not using the
Windows cluster information)
4. Migrate the passive node
5. On the target side, recreate the cluster as appropriate

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