Dell S5048F-ON Stacking

I posted a few days ago aboiut these switches being lumped on me, and having the joy to set them up.

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They have the following software version installed:

Dell EMC Real Time Operating System Software

Dell EMC Operating System Version: 2.0

Dell EMC Application Software Version: 9.12(1.0)

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I have read plenty of configuration guides online but i cannot get these to stack. The commands do not seem to be valid.

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Ive gone through this guide:

https://www.dell.com/support/manuals/uk/en/ukbsdt1/force10-s4048-on/s4048_on_9.9.0.0_config_pub-v1/create-an-stack?guid=guid-54242f11-8166-413a-b463-3abaaf3e6a17&lang=en-us

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There is not a comparable document for the 5048's. But im starting to thinkl they support VLT only.

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Anyone able to assist?