A few more back and forths with Support …
At this time Support have asked me to delete a WeMo device and re-add back (obviously via SLC) and see if that helps. Note, my WeMos already say LAN device and were ‘converted’ by ST as they said they would be so not sure why this delete and readd request is valid but I will try it when I get time. Pain in the behind as it’ll mean adding back to all my SmartApps/automations.