I solved the problem….. I took a chance and flashed the NVR FW to Dahua’s and I can access the cameras via the NVR now. Seems as if the Amcrest FW wasn’t enabling virtual host even though it was enabled.FWIW, the instructions from @Shockwave199 that can be found with the link you provided have the PC or laptop connected to a POE port on the NVR, not to the NVR's LAN port as you discuss. His method assumes the POE NVR provides a virtual server (most do) for the cams on a different subnet.
thank you all