The device is reporting these sensors as unavailable. This probably needs to be directed to Extreme.
ENTITY-MIB is a very standard MIB, any issues are almost certainly related to vendor bugs.
entPhySensorOperStatus.812 = unavailable
entPhySensorOperStatus.813 = unavailable
entPhySensorOperStatus.814 = unavailable
entPhySensorOperStatus.815 = unavailable
entPhySensorOperStatus.816 = unavailable
entPhySensorOperStatus.817 = unavailable
entPhySensorOperStatus.818 = unavailable
entPhySensorOperStatus.819 = unavailable
entPhySensorOperStatus.820 = unavailable
entPhySensorOperStatus.821 = unavailable
Extreme forgot to implement SFP TX Power Channel 1-4 Sensors ...
¯_(ツ)_/¯