IIS Client certificate mapping issue using 1-to-1 mappings.

In an IIS website, we are using 1-to-1 client certificate mappings.  When adding new mappings, we are encountering an issue where 1 certificate mapping disappears in place of the new 1 being added.  

Help.  Happy to provide more information as required.  I can only find information on how to create a mapping, but nothing on issues with mappings that disappear.

Cheers
Patrick
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Microsoft IIS Web Server

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