I have US version home connect and UK version V2 hub
I found that all the things added in “SmartThings” app (for uk) that will be show in “Samsung connect” app (for US)
If add the the hub into home connect it will take over SmartThings cannot add the things or market place but it can expand the zigbee and may mixed us/eu zwave (not tested zwave) also all the “things” still remain of added in SmartThings before
(ActionTiles.com co-founder Terry @ActionTiles; GitHub: @cosmicpuppy)
You are possibly split between two SmartThings Cloud “Shards”. EU uses a different Shard than the 3 in USA.