Concat won't , "-", (The expression is invalid.)

[silaman]

I can't get power automate Concat to do the following, even though I've checked everywhere that using , " ", is ok. Its even in the MS guides

concat(triggerOutputs()?['body/Application_x0020_Code_x003a__x0/Value'], "-",triggerOutputs()?['body/ProjectPart/Value'])

Power automate won't let add it as it says its invalid. 

It will happily run without the ,"-", and smash it all together but just won't allow me to separate with -

I have also tried , '-', as well

For context I am collecting 2 column list values and connecting them together via - to which I am then using it to create a folder 

The folder should be something like ABC-123 but it only wants to do ABC123.

I only really got into power automate a short while ago and am a noob
 

[silaman · Accepted solution]

I got it in the end

If I make "-" a variable I can add it like this

concat(triggerOutputs()?['body/Application_x0020_Code_x003a__x0/Value'],variables('var"-"'),triggerOutputs()?['body/ProjectPart/Value'])

I'll leave this here in case anyone else comes across this