IIS Certificate authentication non domain joined device

Hi All,

I'm trying to setup a IIS website with certificate authentication. I managed to do this with a domain joined device.

But is it also possible with an iOS device? I imported the certificates. But the iOS device doens't have a valid username / password. So how do I need to configure IIS for this?

<authentication>
<anonymousAuthentication enabled="false" />
<iisClientCertificateMappingAuthentication enabled="true">
<manyToOneMappings>
<add name="Allowed Users" description="The clients mapped to this User are allowed in." userName="domain\user" password="[enc:AesProvider:password:enc]">
<rules>
<add certificateField="Issuer" certificateSubField="CN" matchCriteria="Root" />
</rules>
</add>
</manyToOneMappings>
</iisClientCertificateMappingAuthentication>
</authentication>