What firmware version are you running? The specs on the cameras look identical. I thought the N simply meant is was the USA version?
This was the last firmware Dahua had us try:
System VersionV2.630.0000000.6.R
Build Date: 2021-07-07
VersionWEB VersionV3.2.1.1083327
ONVIF Version20.06(V2.9.0.979397)
Algorithm Version1.0.2
ThermalCamera Version20200528
Security Baseline VersionV2.1
This was the last firmware Dahua had us try:
System VersionV2.630.0000000.6.R
Build Date: 2021-07-07
VersionWEB VersionV3.2.1.1083327
ONVIF Version20.06(V2.9.0.979397)
Algorithm Version1.0.2
ThermalCamera Version20200528
Security Baseline VersionV2.1