APM OCSP Responder Issues

I have:

in apm:

configured the OCSP responder under Access > Auth > OCSP Responders

                      ocspfqdn.com/ocsp

added it to the APM policy. 

I have a health monitor to the OCSP responder that is good (tcp)

But its not working. tcpdump shows:

09:12:43.591044 IP F5SELFIP.58606 > OCSPserver1.com: Flags [P.], seq 1:192, ack 1, win 229, length 191: HTTP: POST /ocsp HTTP/1.0 out slot1/tmm0 lis=

09:12:43.602954 IP OCSPserver1.com > F5SELFIP.58606: Flags [FP.], seq 1:462, ack 192, win 1027, length 461: HTTP: HTTP/1.1 404 Not Found in slot1/tmm0 lis=

I'm not quite sure what else I can do here. I will note that I implemented this:

https://my.f5.com/manage/s/article/K12552109

and it didn't work, but all i did was put the OCSP ip behind a simply virtual server, and then add the irule. I dont know if extra configurations were needed.