Just looked at your profile on ZP and you have no ranking (below is where mine shows).
You need to take part in Zwift races (as opposed to group rides like TdZ). ZP then takes your average of your top 3 rides w/kg (it's 95% of your best 20 minute time).
Cat E doesn't exist, it's only for rides where the starters are not split up. I would think you're D cat (<2.4 w/kg). Do a few organised races and after a few ZP will give you a cat
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Ah that’s why! Cheers! I was gonna do the Race to the Alpe tomorrow and there is a Cat D & E category. As I’m unrated and still got a cold I presume if I enter E they won’t disqualify me.
Once I’m better I fancy doing a few crits so hopefully I’ll get my rating then.