Doogee X7 Pro

Doogee X7 Pro
Why won't it let me enable WiFi calling

It won't let me enable WiFi calling. Whenever I press it in settings it doesn't let me on it

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Doogee X7 Pro: Specifications
Display6 Inch - IPS
ProcessorMediaTek MT6735
Memory 2 GB
Internal storage 16 GB
Camera8 Megapixel
SoftwareAndroid 6 Marshmallow
All specifications