I was able to get a proper response using the below utterances, testing with the Alexa simulator. You should check your voice history to see how your requests were transcribed. I noticed that if salón doesn’t have an accent it will fail. However, using persiana de salon works no matter if the accent is present or not. Also, it seems that Abre and Cierre works better than Abra and Cierra.
“Alexa, abre persiana salón”
“Alexa, cierre persiana salón”
“Alexa, abre persiana de salon”
“Alexa, cierre persiana de salon”