On any HIK Vision cameras with a firmware version of 5.5.0 or higher, you must make sure ONVIF is enabled in the camera settings, before trying to add it to Orchid.
You must also add a user on same screen, which is an ONVIF-specific user.
With later firmware you may need to change the Authentication method:
1. Go to Configuration -> Network -> Advanced Settings -> Integration Protocol and set the "Open Network Video Interface (Auth Method?)" setting to "Digest&ws-username token". Hit save.
2. Go to Configuration -> System -> System Settings -> Time Settings and sync the camera time manually or using NTP (I just did it manually). Hit save.