Count Disinct in Aggregation in calculation view

Hi Experts,

I have created a calculation view where i need to count the distinct value for an attribute.

I can create a distinct counter as calculated Colums in default aggregation but when i create it in calculated colums i can not make a universe on it.

So can you please suggest how to count distinct value without any calculated volume so that i can use it in information design tool to make the universe on it.

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Thanks,

Subhash