Is there a known issue with the Oculus touch L menu button?

If I map an input to “Oculus Touch (L) menu” it does not appear to work at all (I’ve even set it to a simple print string function). Is this a known issue, or could somebody let me know how to make this work?

I know that the menu in Walking Dead: Saints and Sinners is mapped to the left menu button, so it’s at least possible to make it work.

I have encountered the same problem. I was able to map every other button except the (L) Menu and (R) System buttons. While system button is better not to tinker with, the (L) Menu button would be nicely welcomed.
If I find a solution I will go back here and report.