[ Custom Triger ]Can not find Group of different sites

[ Custom Triger ]Can not find Group of different sites

Hello Support team, 
I have 1 custom site & 1 default
in Default Settings, I have 'Group A'
in Custom site, I have 'Group B' & 'Group C'

I create a new custom trigger, and when I select Criteria: 'Group'
It shows only 1 Group of Default Setting & I can not find Group B & C



Could you please support 
Regards,
Eric

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