What is considered a "low level" for an Arlo Pro's battery in an IFTTT applet?

[standodd]

I created an applet in IFTTT to email me when a camera's battery is low. What is considered a "low level" in the IFTTT applet parameter? Presently I have a camera with a yellow battery icon and it says its at 20% but it has not triggered an email.

[standodd]

Here's the issue: Checked the applet on IFTTT site and it is triggering periodically but it says "There was a problem with the trigger" causing the email to abort.