Thank you for the follow-up.
It looks like your value is a number, not a string. My comments above were for strings. But, since you have a number here, the quotes are not needed.
What’s being returned isn’t the name of the variable. It’s the default value. While you’re previewing blocks, the context variables use the default values (since there is no context yet).
Would the default of this context variable happen to be “axialVibration”?