Unlimited Energy Doesn't Necessarily Mean Utopia
From a theoretical standpoint, yes, you can take in sunlight and Hydrogen from the solar wind and combine the two into everything society needs.
From a practical standpoint...
Turning Hydrogen into Iron is going to require repeatedly fusing elements, then running the results through a separation process, since you will get some other, non-target elements out of each step.
The largest, most advanced fusion project humanity has ever attempted has cost tens of billions, takes up significant physical space, and resulted in approximately zero fusion to date. So I think it's unlikely that we will ever build a society where everyone has their own personal fusion setup.
Control Enables Corruption
If everyone needs to go to a "fusion provider" to transform their Hydrogen into whatever else they need, then the fusion provider is in a position of power. They can deny or delay access, which is a potential source of conflict. There are lots of potential solutions to this access process, ranging from near-utopia to tyrannical dictatorship.
Generally, having many different, independent, fusion providers is likely to produce a better society - each provider has less power, and therefore less ability to control others. If you want something more dystopic, consolidate the fusion providers.
Secondary Avenues of Power
If people in the Dyson Cloud need to collect masses of Hydrogen, and physically move them to the fusion provider, then the people who do those activities also potentially have power over other people in society. There are bound to be choke points on the approach to the fusion providers, and to the best places to collect mass. The people who "own" (or can threaten) those approaches can charge tolls.
Likewise, people will need designs and recipes to build what they need. This will require knowledge, which could be shared freely or could be controlled with Intellectual Property restrictions.
Human nature being what it is, I doubt Utopia is possible. It is certainly not inevitable just by providing unlimited energy.