Dell vxrail vsan & hci compute mesh cluster

I’m not sure if I’m in the right section or not. At work we have a new dell vxrail cluster all flash vsan array. We have our older clusters running of FC SAN. I just can’t seem to get the other clusters to mount the remote data store from the vsan cluster via the gui. Everything shows up like in the documentation but when it gets to precheck , it fails to run precheck. No warning no error message other than “failed to run precheck”.