Please refer to the LOA posted in Pubs/Policies/LOA: Edmonton FIR - Vancouver FIR

Edmonton (CZEG) FIR controls 20,192 square kilometres of high-level airspace inside the Vancouver CZVR FIR controlling FL250 and above for the CRANBROOK sector. When Edmonton is offline, Vancouver assumes control.

Why does this not show up on VATSPY/Vatsim-Radar?
The VATSPY/Vatsim-Radar repositories that hold this information have been updated to include this airspace, however they do not reflect on those utilities. Edmonton airspace is accuratly documented on the VATGlasses respository which will hopefully be made availible in Vatsim-Radar soon.