If NTP sync is successful to 10.10.194.226 but not successful to 10.10.194.165 it either indicates that there is a problem in communication for NTP to 10.10.194.165 or it means that there is some issue with NTP on that device.
In an earlier post in this thread you posted this output
firewall(config)# show ntp association
address ref clock st when poll reach delay offset disp
~10.10.194.165 10.10.97.4 16 737d 64 0 1.0 44030. 16000.
I believe that if the ref clock is non-zero that you are communicating NTP with the device. So there must be something about NTP on that device. We have asked before, and I will ask again - what kind of device is 10.10.194.165?
HTH
Rick
HTH
Rick