How can I properly pass a string to a function in a ModuleScript?

I need help passing this string to a ModuleScript as an argument because the current method I'm using is just converting it to a table value or something.

I have a ModuleScript with a function called close which has one argument called containment. Here is the part of that function I'm having issues with:

local module = {}

function module.close(containment)
		
	local door = script.Parent[containment .. " [1] [SHUTTER]"]

	-- The rest of the code has been omitted because it is functional when containment's value is "SCP-330".
	
end

return module

I am calling it from a Script using this code:

local module = require(workspace.Shutters.ModuleScript)

module:close(script.Parent.Parent.Parent["Field Codes"].ItemNumber.SurfaceGui.TextLabel.Text) -- This text is always "SCP-330".

When the function is called like this, the ModuleScript returns the following error:

03:12:12.473 - Workspace.Shutters.ModuleScript:40: attempt to concatenate local 'containment' (a table value)

I should also note that I get this error no matter what, even if I try to use module:close("SCP-330").

I added a line of code to close that prints the value of containment. It returned the following:

table: 0000026DA172D2F0

I didn't use a table, and I have no idea where the random matrix of numbers came from.

It should also be noted that if I use Studio's Command Bar to call the function, it works as intended.