Can't animate certain objects of parent when attempting to

I’m animating guns for a project but unfortunately I have an error and don’t know how to fix it. When trying to making a gun equipping animation I’ve put the gun in the parent of the dummy but i’m unable to move or animate the gun. What I mean by this is that while everything else can be seen highlighted in blue when hovered over the gun doesn’t do that. How can I fix this?

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put an attachment from the gun to the hand