Dell UPS Rack 1920W HV (H928N) Does not detect environmental sensors

I have Libre monitoring the above Dell UPS via the management interface. It is working well but I also have the environmental sensor installed (temp and humidity) and this appear not to have been auto detected (it does appear on the devices webui). I was wondering whether I am doing something wrong or whether there is a quick fix (i not MIB support is now depreciated?).