You have a few problems.

1

Basically, you're trying to move the player in workspace, which in-game wouldn't work because your player isn't named Player. Now, in studio that won't work either. You need to use part, which is explained in your function.

2

You're trying to CFrame the player! There is another method of teleportation, but the main problem is that you're not changing their torso's CFrame.

Now, I would like to change a few things in your code. I'm gonna use "GetPlayerFromCharacter" to get the player's Character. I'm also gonna use "MoveTo", which is basically a better way of teleportation in this scenario.

script.Parent.Touched:connect(function(part)
    local player = game.Players:GetPlayerFromCharacter(part.Parent)
    local character = player.Character
    if character ~= nil then
        character:MoveTo(Vector3.new(2.6, -0.38, 45.26, 0))
    end
end)

Finally, this is the code. As you can see on line 5, I put a 0 at the end because you need to use 4 different arguments. Figure out what you wanna change that to if you even want to, otherwise leave it be.

--Note you do not need Vector3.new as cframe.new already has its own parameters.
--Define Player
--CFrame is not a valid member of character
--Altho it would be a valid member for parts of the character.
--In Studio if u wanna change the name u can.
function onTouched()
    game.Workspace.RRCTrooper.Torso.CFrame = CFrame.new(2.6, -0.38, 45.26)
end
workspace.Base.Touched:connect(onTouched) -- I made it Base but u can change that