When running the CAM controller + UI on a 3.x cluster, the PV discovery step of the wizard after selecting the namespaces will hang while trying to load and never report the results. We've diagnosed this issue and the core problem is that the metadata.generation field, which the UI watches for its stop condition, fails to increment when expected. Fundamentally, CRDs did not support this field until roughly 1.11 timeframe, so CAM needs to shift to using a solution that is version agnostic to the underlying cluster. To be clear: this is a change that needs to happen in both the UI and the controller, and they'll need to coordinate to use the same strategy.
https://github.com/konveyor/mig-ui/pull/842
Verified using CAM 1.2 stage 3.9 (controller) -> 4.3 openshift-migration-rhel7-operator@sha256:6afd508558cdbfdfa05b46d0d02c46af59404a1f2bfd09c3272bbcf41900996d Migrations could be executed without errors, with and without PVCs. There was no problem regarding PVC discovering either.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2020:2326