How do I use a custom vocabulary when using Amazon Transcribe streaming?

Hello, I am following this code: https://github.com/brandonmwest/amazon-transcribe-websocket-express

I was able to get it to work and transcribe my audio in real time. The thing is, I wanted to add a custom vocabulary. I made one on aws services by signing in and uploading a txt file. It says it is Ready. I then went into the code and added a new param &vocabulary-name="myvocab" where myvocab is the name of the vocab I uploaded on aws. I get this:

"The specified vocabulary doesn't exist. Check the name and try your request again."

What am I doing wrong? Thank you for any help