XF 2.2 Greyed out members?

[Punt Road End]

I cannot find a reason why some members are greyed out, anyone have an explanation?

 

[BassMan]

You can see them as administrator, but they have unchecked their online status in the Privacy options.

 

[Paul B]

They have opted to hide themselves - account/privacy .

 

[Punt Road End]

Thank you @BassMan @Brogan