Windows 10 - Cert. Based Auth. - Computer does not use Cert

Hello

I'm helpless here.

I wannt to rollout a Client Cert to Win. 10 Clients for Auth. on the WLAN.

But the Problem is, anytime i set up the connection on the Client, i get a "cant connect because you need a certificate to sign in."

What are the Req. for the Client Cert?

It is a CLient Problem, as i can see on the WLC the IdentityRequest - and no Response from the client, as he does not finde a usefull certificat. But Why?

What is wrong with my Cert. ? I cannot finde any usefull Guide for this.

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