Struggling to remove server from Rack

currently racking my brain at this one, i'm struggling to remove the below server out of the rack, I haven't come across this type of rail before, usually I can pull a server out and there will be clips which once pressed I can lift it up.

Can anyone spot the obvious thing i'm missing?

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Solution 1:

Push in the red circled area. This will move the tab in the blue circled area clear of the stop, and you can then pull the server out. enter image description here