Was there a resolution to this question without raising a support ticket? I have followed the steps exactly and have the same issue. Do I just raise a support ticket?
I had the same issue, kept getting unknown error, but found this: https://community.powerbi.com/t5/Issues/Can-t-upgrade-Classical-workspace-to-new-workspace-experienc...
I also removed the logo image (same as person mentioned added and then removed image) and then my upgrade worked, bit of a faff but quicker than raising a support ticket.
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