Trying to use an input in a manual trigger to build out the end of a file path for copying files. Here is the flow configured:

And here is the error:

As you can see, the input parameter, IT-001, is showing up correctly as part of the filepath string. But for some reason, it is erroring out.
It is worth noting that when i replace the input paramter in the filepath with the explicit filename IT-001, it works.
Is there something I need to do with dynamic content as part of a filepath in order for it to be interpreted correctly?