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Most probably you are hitting a well-known bug:
Bug 13873275 : MOD_WLS IS NOT WORKING WHEN USING OHS 188.8.131.52 AND WLS 10.3.6 TO FORWARD SHA-256
You must have an Oracle Support account in order to access the necessary materials and get the corresponding patch from support.oracle.com. Look for more information at article 1454591.1 in Oracle Support Knowledge Base - "When Using OHS 184.108.40.206 And WLS 10.3.6 To Forward Client Certificates, The Certificate Is Not Passed".
Some time ago I was hit by the same bug and I spent a lot of time until I realized that it was a bug. I was using Apache 2.2 + WLS Plug-In 1.1 trying to pass the client certificate to WLS with no luck. I tried also Apache 2.0 + WLS Plug-In 1.1 with no luck. Eventually I succeeded with Apache 2.x + WLS Plug-In 1.0. WLS Plug-In 1.0 is claimed to be deprecated, but it worked fine for my needs. You can try with it as a possible workaround. WLS Plug-In 1.0 is packaged and installed automatically as part of a standalone WebLogic Server installation. (You must be aware that there is no special WLS Plug-In 1.0 for OHS but there is for Apache HTTP Server).