Join cluster fails for 4th PC (ssh?)

I installed a host using a usb stick (version 8.0.x?) Then I installed 2 more with the same USB stick. Fumbled around with clusters (I support a VMware environment at work - so I have the basic idea). I installed several disk sources (Cifs, NFS) - basic resources, migrated a VM to one of the other hosts in the cluster (maybe I cloned it) - it's been a short while since I did it (the clone works too).

Then I went to install a new PC from Dell - big mistake - which doesn't support Legacy...

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