You need to use

set tSC=##class(EnsPortal.Utils).ItemSettings("Production.Name||Item.Name",.settings,.colNames)

Where ProductionName  is Production class. If ProductionName is not given, then the currently running or last run Production will be used. Item.Name is config name, not class. In your case you can call:

set tSC=##class(EnsPortal.Utils).ItemSettings("My.BP.AA",.settings,.colNames)

To get the settings of My.BP.AA host.

I have not found the function (NameExists) in the documentation

Note, that the index "Name" is defined in this class. <Index>Exists is just an automatically generated method that returns a boolean  (Passed index value exists). You can read more about autogenerated methods here.

Direct global update instead of SQL maybe?

Check the answer by @Dmitry Maslennikov, it seems to do precisely what you need.

Everything seems fine.

I'd recommend checking with HTTP Debugging proxy what request actually gets sent. Article on that.

tl;dr plan:

1. Install Charles proxy (or Fiddler).
2. Start it.
3. Redirect your BO traffic to the proxy port.
4. Check what is actually sent.

Alternatively if you can run the BO locally you can modify the outbound adapter to send the request with Test=1 value and check what's sent.

My advice is not to write your own code, but to use this guide. You don't need to parse CSV manually.

My bad, I've done the UnCompile  but forgot to remove already generated methods.

Unrelated but it's better to return a status from a generator method:

ClassMethod GenerateMethods() As %Status [ CodeMode = objectgenerator ]
{
    For i=1:1:%class.Methods.Count() {
        #dim method As %Dictionary.MethodDefinition = %class.Methods.GetAt(i)
        Continue:((method.Description["@AutoGenerated") || (method.CodeMode="objectgenerator"))
        Do %class.Methods.Insert(##class(util.TestGenerator).Generate(method.Name_"DoSomethingElse",%class.Name))
    }
    Quit %class.%Save()
}

What flags are you compiling with? For me it works on a first compilation:

USER>do $system.OBJ.UnCompile("util.*")
 
Uncompiling class util.Test
Uncompiling class util.TestGenerator
USER>do ##class(util.Test).TestOneDoSomethingElse()
 
DO ##CLASS(util.Test).TestOneDoSomethingElse()
^
<CLASS DOES NOT EXIST> *util.Test
USER>do ##class(util.TestGenerator).Generate()
 
DO ##CLASS(util.TestGenerator).Generate()
^
<CLASS DOES NOT EXIST> *util.TestGenerator
USER>do $system.OBJ.Compile("util.*")
 
Compilation started on 06/12/2018 20:13:00 with qualifiers ''
Compiling 2 classes, using 2 worker jobs
Compiling class util.TestGenerator
Compiling routine util.TestGenerator.1
Compiling class util.Test
Compiling routine util.Test.1
Compilation finished successfully in 0.012s.
 
USER>do ##class(util.Test).TestOneDoSomethingElse()
util.Test||TestOneDoSomethingElse

As you see from the log both classes don't exist, but after one compilation I can call TestOneDoSomethingElse method and it works. What's your output for:

do $system.OBJ.UnCompile("util.*")
do ##class(util.Test).TestOneDoSomethingElse()
do ##class(util.TestGenerator).Generate()
do $system.OBJ.Compile("util.*")
do ##class(util.Test).TestOneDoSomethingElse()

Not in  InterSystems IRIS though.

There are system implementations too:

>write $$toRoman^%bi.SWr.FolderTest(124)
CXXIV
>write $$toRoman^%bi.SWr.FolderTest(1245)
MCCXLV

Not that Count approach is while easiest, can significantly slower the query down.

Extending the adapter so you have an "after all rows" callback has speed advantage and also you wouldn't need to rewrite your queries to add Count().